Your First Trimester: What to Expect in the First 13 Weeks

Congratulations (or maybe you’re just wondering)! The first trimester is full of change — both exciting and a bit overwhelming. Here’s your go-to guide for the early stages of pregnancy.

Could you be pregnant? For many, the first trimester begins with a feeling — a missed period, a twinge of nausea, or just the sense that something is different. These early weeks are full of quiet but powerful changes as your body starts the journey of growing new life.

Symptoms: What You Might Feel

The first signs of pregnancy can show up even before you confirm it. You might feel unusually tired, experience breast tenderness, or notice changes in your mood or appetite. Nausea (with or without vomiting), sometimes called morning sickness, often starts around week 6. Some people also develop food cravings or aversions. It’s a lot — but it’s all part of your body’s early response to pregnancy hormones.

Baby’s Growth: From Poppy Seed to Peach

It’s hard to believe, but by the end of the first trimester, your baby has gone from the size of a poppy seed to a peach. Their organs are forming, and they’re already starting to move — even if you can’t feel it yet.

Prenatal Checkups and Vaccines

Your first prenatal visit typically happens between weeks 6 and 8. Your doctor will confirm the pregnancy, calculate your due date, and do basic labs: blood type, CBC, and screenings for infections like HIV and hepatitis. An early ultrasound may be done to check the heartbeat. If you haven’t already, it’s also a good time to get your flu vaccine and make sure you’re up to date on tetanus.

Things to Keep an Eye On

Some light spotting can be normal, especially early on. But if it becomes heavier or is accompanied by cramping or back pain, it’s best to call your doctor. Severe or constant nausea, high fevers, or any signs of infection are also worth checking in about.

When to Seek Help

Reach out to your healthcare provider if you experience heavy bleeding, sharp abdominal pain, fainting, or signs of dehydration. It's always better to ask — no question is too small when it comes to your health and your baby.

Book an OBGYN Consultation at Hati Health!

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Special Tips!

Rest when you can. Fatigue in early pregnancy is very real and very normal. Stay hydrated, eat small meals frequently, and begin taking prenatal vitamins if you haven’t already — especially those with folic acid, which helps prevent early birth defects. And finally, give yourself grace. Every pregnancy is different, and your experience is valid.

Want week-by-week support as you go?

Explore the Hati Health Pregnancy Calendar — your guide to what’s happening inside your body and how to care for yourself and your baby each week.