Cramping in early pregnancy: causes and when to get help

If you might be pregnant and you have pain with bleeding, or pain in the tip of your shoulder, act on that first. The NHS treats bleeding in pregnancy as an emergency when it comes with severe abdominal pain, pain in the shoulder, or feeling sick, faint or dizzy, and when it is heavy enough to soak a period pad soon after you put it on (NHS, "Vaginal bleeding in pregnancy", 2026). In the UK, call the emergency number or go to A&E, the hospital emergency department; in the US, call the emergency number or go to the nearest emergency room. The box above shows the emergency and urgent numbers for where you are, and get help now lists the other symptoms that need checking straight away.

Cramping in early pregnancy is common

The NHS says stomach, or abdominal, pains and cramps are common in pregnancy, and that while they are usually not a sign of a problem, they can sometimes be a sign of something more serious that needs to be checked. It describes the less serious pains as mild ones that go away when you change position, rest, do a poo or pass wind (NHS, "Stomach pain in pregnancy", 2024).

How common cramping early in pregnancy is has been measured. In a US study that followed couples from before conception, 341 women with a positive home pregnancy test recorded their symptoms every day from 2 to 7 weeks after conception, and 85 in 100 recorded lower abdominal cramping at some point in those weeks (Sapra et al., 2016). Mayo Clinic lists mild uterine cramping among the less obvious early signs of pregnancy (Mayo Clinic, 2024). Cramping during early pregnancy, or early pregnancy cramping, is therefore something most women in that study recorded. A figure for a group says nothing about the cause of any one person's cramping while pregnant.

What causes early pregnancy cramps

The NHS lists three causes of stomach pain in pregnancy that it treats as not serious, and says the pain can be dull or sharp (NHS, "Stomach pain in pregnancy", 2024). These are the causes of early pregnancy cramps it names before its list of conditions that need urgent attention:

Round ligament pain, the term used in the US, is what the NHS calls ligament pain. The NHS links it to the ligaments stretching to support a growing bump and does not give a week when it starts (NHS, "Stomach pain in pregnancy", 2024).

Early pregnancy pain areas are a common search. Of the causes above, the NHS places only ligament pain, on one side of the lower tummy. Its urgent list below adds lower back pain with stomach pain, and its description of ectopic pregnancy adds pain in the tip of the shoulder (NHS, "Stomach pain in pregnancy", 2024). None of the sources cited here maps early pregnancy cramps to a place in the body that rules a cause in or out.

Constipation, wind and bloating

Two of the three causes the NHS lists come from the gut rather than the uterus: constipation, which it says is common in pregnancy, and trapped wind (NHS, "Stomach pain in pregnancy", 2024). Mayo Clinic says the hormonal changes of early pregnancy slow the digestive system, which can lead to constipation, and that they can also cause bloating like the feeling at the start of a period (Mayo Clinic, 2024). Cramps in early pregnancy that ease after a poo or after passing wind fit the NHS's description of the less serious pains; pain that does not ease, or that comes with any of the symptoms in the urgent list below, needs a call.

Period cramps vs early pregnancy cramps

Period cramps vs early pregnancy cramps is one of the most searched comparisons in early pregnancy, and the sources cited here give no way to tell them apart by how they feel. Mayo Clinic says many early signs of pregnancy are not unique to it and that some can mean a period is about to start, and it describes the bloating of early pregnancy as similar to the start of a period (Mayo Clinic, 2024). Period-like cramps during early pregnancy therefore do not show that a period is coming, and do not show that you are pregnant.

A test is how to find out. The NHS says most pregnancy tests work from the first day of a missed period, or at least 21 days after unprotected sex if you do not know when your period is due (NHS, "Doing a pregnancy test", 2022). How soon can you take a pregnancy test compares the UK and US advice. Cramps in the days before a period is due are often searched as implantation cramps, and the guide on when implantation occurs sets out what is and is not known about them.

What do early pregnancy cramps feel like?

The sources cited here say little about what early pregnancy cramps feel like. Mayo Clinic describes the cramping as mild (Mayo Clinic, 2024). The NHS says stomach pains in pregnancy can be dull or sharp, and that ligament pain can feel like a sharp cramp on one side of the lower tummy (NHS, "Stomach pain in pregnancy", 2024). Descriptions that go further, such as a pulling, pinching or prickling feeling that sets pregnancy cramps apart from period cramps, do not come from these health bodies.

When cramping needs urgent help

When to worry about cramping in early pregnancy is set out in the NHS's urgent list. It advises calling your maternity unit immediately if you have stomach pain and any of these (NHS, "Stomach pain in pregnancy", 2024):

• vaginal bleeding or spotting;
• regular cramping or tightenings;
• lower back pain;
• vaginal discharge that is unusual for you, or fluid leaking from the vagina;
• pain when you pee, or needing to pee suddenly or more often than usual;
• pee that looks cloudy, pink, red or brown;
• stomach pain that is severe or does not go away after you have rested for 30 to 60 minutes.

If the maternity unit is not available, the NHS points to its urgent advice line, and says that if you are under 20 weeks pregnant you may need to contact your GP or an early pregnancy unit. The conditions it names as causes of serious stomach pain are ectopic pregnancy, miscarriage, pre-eclampsia, premature labor, placental abruption and urinary tract infections. It says the symptoms of an ectopic pregnancy typically appear between 4 and 12 weeks and can include tummy pain and bleeding, pain in the tip of the shoulder and discomfort when peeing or pooing (NHS, "Stomach pain in pregnancy", 2024).

For pain with bleeding, the NHS gives the emergency signs in the paragraph at the top of this guide, and says light bleeding or spotting with mild tummy pain needs urgent help (NHS, "Vaginal bleeding in pregnancy", 2026). In the US, ACOG says vaginal bleeding is sometimes the only sign of an ectopic pregnancy, that other symptoms can include abdominal, pelvic or shoulder pain, and that you should call your ob-gyn right away if you have them (ACOG, "Bleeding During Pregnancy", 2021). Bleeding in early pregnancy lists who to contact where you are, and spotting during pregnancy covers bleeding with or without pain.

Cramping by week

Cramps in early pregnancy are usually searched by week. Cramping at 4 weeks pregnant, cramping at 5 weeks pregnant and cramping at 6 weeks pregnant all fall inside the 2 to 7 weeks after conception in which the Sapra study recorded symptoms, on the usual count in which conception comes about two weeks after the last period starts (ACOG, "How Your Fetus Grows During Pregnancy", 2024). That match is our arithmetic. None of the sources cited here gives advice for cramping that differs by week in the first trimester, and the urgent list above applies throughout.

The week-by-week guide sets out what the NHS describes at 4 weeks pregnant, 5 weeks pregnant and 6 weeks pregnant, and early pregnancy symptoms lists the other signs that tend to come in those weeks.

This guide is information, not a diagnosis or a recommendation of treatment, and it is no substitute for your own clinician. See the medical disclaimer.