The Ultimate Guide to Pregnancy (Weeks and Months)

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The pregnancy journey is one of the most exciting parts of pregnancy for many women. It can also be one of the most confusing parts, especially if you are not sure what week you are currently in. If this sounds like your situation, then read on! This blog post will walk you through everything that happens during pregnancy weeks 1-40, including how to calculate your pregnancy weeks and months.

This pregnancy journey is different for every woman. Your pregnancy weeks and months may not follow exactly what you read here, but it should give you a good idea of what to expect as your pregnancy progresses.

The first trimester (weeks 0-13)

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As soon as conception occurs, the fertilized egg begins dividing into many cells. This process is called cleavage and it will continue as the egg implants into your uterus. About half of all fertilized eggs never implant, but if one does, the pregnancy journey has begun! The first trimester is a time of big changes for your body. The hormones that are released during pregnancy cause your breasts to grow and get heavier. You may also start to experience pregnancy symptoms like nausea, fatigue, and mood swings. The first trimester is a time of growth for your baby too. This is when the neural tube forms and the basic structures of the brain, heart, and other organs are developed. Around week six or seven, you will be able to find out if you are having a boy or girl.

The second trimester (weeks 14-27)

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During pregnancy weeks 14-20, your uterus is growing larger and the cells of your baby are multiplying rapidly. Your belly will probably start to look rounder at this point too! This pregnancy week marks the end of nausea for most women, but many will start to experience heartburn and constipation. The second trimester is also a time of growth for your baby. The bones in their body harden and the muscles get stronger. By pregnancy week 20, they are about the size of an orange.

In the third trimester (weeks 28-40)

In pregnancy weeks 28-32, your baby continues to grow and develop. You may start seeing a visible tummy at this point! Your ankles will probably swell too from the extra fluid in your body. During pregnancy week 36, you are considered full-term and just one week away from birth. Your baby is also almost full-size at this point. In pregnancy weeks 37 and 38, you will start going into labor as the baby gets ready to be born! The placenta also begins to detach from your uterus. This process is called placental abruption and it causes vaginal bleeding or severe abdominal pain. In pregnancy week 39, most women go on bed rest at home, just in case they go into labor. This pregnancy week is also known as your due date! Be prepared for some excitement this pregnancy month – it’s time to have a baby.


The above weeks and months details of pregnancy should give you a good idea of what to expect as your pregnancy progresses. Keep in mind that every pregnancy is different and yours may not follow exactly what you just read, but it’s a great starting point.

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