The first three months of pregnancy can feel like a lot to take in. One morning you feel perfectly normal, and by evening your body has a mind of its own.
Pregnancy runs for about 40 weeks, and doctors split that stretch into three chapters called trimesters. The first covers weeks 1 to 13, the second runs from weeks 14 to 27, and the third carries you from week 28 all the way to the finish line at week 40.
To help you know what's ahead, here's a week-by-week walk through what many women experience, from the very first week to the close of the first trimester.
Note: Every pregnancy is different. You may notice symptoms early or go weeks without any. Both are normal.
The Countdown Starts Before You're Pregnant
Week 1: The odd head start
Doctors count your pregnancy from the first day of your last period (LMP), so week one starts before you've even conceived. Nothing is growing yet. Expect the familiar company of cramps, sore breasts, mood dips and bleeding.
Week 2: The big moment approaches
Ovulation usually falls here. An ovary releases a ripe egg, which drifts into the fallopian tube to wait for sperm. Not everyone feels it, but some notice a twinge low in the belly, tender breasts, a warmer morning body temperature (BBT), or clear, stretchy discharge much like raw egg white.
Week 3: The egg settles in
The fertilized egg tucks itself into the lining of the womb. You might feel mild cramping or see a little spotting, often called implantation bleeding. Heavy bleeding or sharp pain is different. Call your provider promptly, because it can point to an ectopic pregnancy, where the embryo grows outside the womb, usually in a fallopian tube.
The early signs arrive
Week 4: The two lines
This is when a home test can first turn positive. Sore, sensitive breasts are among the earliest clues for some women. Others notice that smells and tastes seem turned up, along with tiredness, bloating, constipation and mood swings. If you feel nothing, that's fine, because symptoms can take a few more weeks to appear. Having few or no symptoms is completely normal and does not mean the pregnancy is unhealthy. Now is also a good time to book your first prenatal appointment.
Also Read: Maternal mental health during pregnancy and after childbirth: Signs you should not ignore
Week 5: The emotional rollercoaster
Hormones can swing your mood from cheerful to teary to irritated within a single afternoon, sometimes for no reason you can name. Fatigue, tender breasts and the first waves of nausea can join in.
Week 6: Enter morning sickness
For many women, this is when queasiness arrives, although it can start later or skip you altogether. A sharper nose can make it worse, and it often brings strong cravings and sudden dislikes.
It can last into the second trimester, so build your coping kit early:
- Smaller, more frequent meals
- Ginger
- Acupressure wristbands
- Steering clear of whatever sets you off
Week 7: Mapping the bathrooms
You may find yourself dashing to the toilet far more often. Pregnancy hormones, extra fluid in your body and busy kidneys all play a part. Later, your growing womb adds pressure on the bladder. Know where the nearest bathroom is!
Week 8: Everything at once
For many women, symptoms peak around now. Nausea, tiredness, sore breasts, bloating, mood swings and frequent urination can all show up together. You might also notice extra saliva, which can linger until the end of the trimester. Headaches are common too, thanks partly to surging hormones.
Settling into the rhythm
Week 9: Your digestion slows down
Pregnancy hormones slow the movement of your intestines, so constipation and gas are frequent visitors, along with morning sickness. The slowdown can increase as your baby grows. If it becomes a real problem, ask your provider about stool softeners instead of grabbing something off the shelf.
Also Read: The science of timing, when you're most likely to conceive
Week 10: glow, or breakouts?
Some women get the famous radiance. Others get hormone-driven pimples. Either way, you'll probably notice your breasts and belly rounding out a little more each week.
Week 11: stretching pains
As your bump grows, you may feel aches or tugging around your lower belly, known as round ligament pain. It can be a mild nuisance or surprisingly sharp. You may also see a clear or milky discharge called leukorrhea, which is a normal part of pregnancy.
Week 12: A map of blue lines
Your blood volume rises by roughly half during pregnancy. One visible effect is veins showing through the skin, especially on lighter skin tones.
Week 13: The home stretch
Many of the early symptoms ease as the first trimester ends. Dizziness can sneak in, though, as hormones, changes in blood flow and lower blood pressure team up. Drink plenty of water and stand up slowly.
Also Read: Samantha's pregnancy puts myositis in focus: Is healthy pregnancy with autoimmune disease possible?
When to pick up the phone
Most first-trimester discomforts are part of the process, but a few deserve a prompt call to your doctor or midwife:
- Heavy or steady bleeding, or bleeding with cramps
- Severe or one-sided pain in the belly
- Nausea so strong you can't keep food or fluids down
- A fever above 101°F (38°C)
- A headache that is sudden, severe or unlike any you've had before
If something feels wrong, trust that instinct and ask. Your care team would much rather hear from you than not.
(Disclaimer: This article is for general information and is not a substitute for medical advice)