Early Signs of Pregnancy: The First Symptoms and When They Start

What are the early signs of pregnancy?

The most common early sign of pregnancy is a missed period, and Cleveland Clinic lists tiredness, sore or swollen breasts, nausea and needing to pee more often as the other common signs. The NHS adds constipation, more vaginal discharge, a metallic taste in the mouth, a sensitivity to certain smells, new food cravings or a loss of interest in foods, mood changes, and a very light bleed around the time your period is due, known as implantation bleeding.

None of these signs proves a pregnancy on its own. Cleveland Clinic points out that a missed period can also come from stress, excessive exercise or hormone imbalances, and that testing is the only way to know for sure.

How soon do pregnancy symptoms start?

Pregnancy symptoms usually start when you are around 4 to 6 weeks pregnant, according to the NHS. Cleveland Clinic says some people feel symptoms as soon as they miss a period, while others don't feel pregnant until several weeks after a positive test.

Two studies followed women from the time they were trying to conceive. In a study of 221 women by the US National Institute of Environmental Health Sciences, published in the Journal of Clinical Epidemiology in 2002, half of the 136 women who went on to have a live birth had symptoms by day 36 after their last menstrual period, and 89% had them by the end of the eighth week. A UK study of 256 women in BMC Pregnancy and Childbirth in 2021 found that, among those who had nausea or vomiting, it began a median of 32 days after the last menstrual period, or 16 days after ovulation.

ACOG says nausea and vomiting of pregnancy usually starts before 9 weeks, and for most women it goes away by 14 weeks. Easing morning sickness covers what helps.

Can you have pregnancy symptoms before a missed period?

Yes, Cleveland Clinic says you might have pregnancy symptoms before you miss your period. Implantation bleeding is one, and Cleveland Clinic says it usually happens about 10 to 14 days after ovulation, in most cases before people have missed a period or taken a test.

Nausea can come this early as well. In the 2021 BMC Pregnancy and Childbirth study, two-thirds of the women with nausea or vomiting had their first symptoms 11 to 20 days after ovulation, and only 5% started earlier than that.

A home test may still be negative at this stage. Cleveland Clinic says taking a test too soon can give a false negative, and when to take a pregnancy test explains the timing.

What does implantation bleeding look like?

Implantation bleeding is light spotting, usually pink or brown, that Cleveland Clinic says can last a few hours or a few days and should stop on its own after about two days. ACOG explains that light bleeding or spotting can happen 1 to 2 weeks after fertilization, when the fertilized egg implants in the lining of the uterus.

Cleveland Clinic says about 1 in 4 pregnant women have implantation bleeding. It describes it as light enough that a panty liner is usually all you need, and says bleeding that soaks through a pad, contains clots, or is bright or dark red is usually not implantation bleeding. Cleveland Clinic adds that any cramping with it should be mild and less intense than period cramps.

Bleeding at this stage has other causes too. ACOG says bleeding in the first trimester happens in 15 to 25 in 100 pregnancies, and spotting during pregnancy covers what it can mean.

Can you be pregnant and have no symptoms?

Yes, you can be pregnant with no symptoms: Cleveland Clinic says you may feel your body changing before you know you are pregnant, or you may not notice any symptoms at all, and the NHS says not everyone has all of the early signs. In the 2002 Journal of Clinical Epidemiology study, 89% of women who had a live birth had symptoms by the end of the eighth week after their last period; the rest had none yet.

When should you call your doctor or midwife?

The NHS says some early signs of pregnancy are usually nothing to worry about, while vaginal bleeding, stomach pain and pelvic pain may be a sign of something more serious. It adds that symptoms of an ectopic pregnancy, where the pregnancy grows outside the uterus, usually develop between the 4th and 12th weeks of pregnancy. Call your doctor or midwife if you have:

• Any vaginal bleeding. ACOG says to contact your OB-GYN if you have bleeding at any time in pregnancy, and that bleeding is sometimes the only sign of an ectopic pregnancy. Cleveland Clinic says it's OK to call if you can't tell what kind of bleeding you have, and to call if it is heavy, contains clots, or comes with cramping and pain.
• Pain in your belly, pelvis or shoulder, which ACOG lists as other symptoms of an ectopic pregnancy and says to call your OB-GYN about right away.
• Pain or pressure in your bottom when you poo, pain when you pee, or diarrhea, which the NHS also lists as possible ectopic symptoms if you think you might be pregnant.
• Cramps that are severe or on just one side of your body, which Cleveland Clinic says to contact your provider about.
• Nausea and vomiting with signs of dehydration, which ACOG lists as a small amount of dark urine, being unable to pee or keep down liquids, feeling dizzy or faint when you stand up, or a racing or pounding heartbeat.
• Feeling anxious or depressed, or having thoughts of harming yourself. Cleveland Clinic says to reach out to your healthcare provider right away.