As you move out of your first trimester understanding what to expect at 13 weeks pregnant can bring on new feelings and emotions.

Your body has seen lots of changes take place in the first three months as your baby has quickly developed. These changes may have caused some unpleasant pregnancy symptoms, which thankfully should start to pass as you move into your second trimester.

How big is my baby?

At the start of trimester two, your beautiful bundle of joy will now be the size of a small apple.

Your baby at 13 weeks pregnant

At around 8cm in length, your baby’s head is now one third of the size of its body.

Babies are very busy at the start of their second trimester, kicking, stretching and moving around, but you won’t feel any of this just yet. Your baby’s organs will also start to shift into their permanent position in the body as they continue to develop vital organs.

Your placenta is growing at quite a rate and your baby is now sourcing its oxygen and key nutrients through its umbilical cord. The placenta is amazing life support for your baby and will also efficiently get rid of all your baby’s waste.

Vocal cords will start forming this week in preparation for keeping you and your partner awake for the next few years. Over the last few weeks, your baby will have developed the ability to suck so they may start sucking their tiny cute little fingers and thumbs this week!

Symptoms to expect at 13 weeks pregnant

The second trimester should (hopefully) see the end of morning sickness and fatigue once and for all.

However, there are a number of new pregnancy symptoms to face in your second trimester (good and bad).

Higher sex drive


Many women find a new lease of energy in their second trimester. This is due to an increase in pregnancy hormones and you may find yourself suddenly shaving your legs again and searching out those old Barry White CDs. A healthy appetite for sex in trimester two is rather common and can have huge health benefits for you and your baby.

Having sex when you are pregnant can help improve your mood, help you sleep better and tighten up those pelvic muscles which will help you in postpartum.

If you have any underlying health conditions that involve miscarrying then make sure you talk to your GP before embarking on any sexual activity, whilst in the first few trimesters of your pregnancy.

Increased energy

Your placenta starts to take over providing your baby with its nutrients in trimester two. It’s very common for pregnant women to feel like they have more energy when this happens.


As your progesterone levels increase, unfortunately, constipation often becomes a pregnancy symptom in trimester two.


As your pregnancy hormones start to skyrocket you may start to notice food cravings. Embrace your cravings and remember – it’s never too late to send your partner out at 2 am for that M&S Chicken Mayo wrap…


There is a lot of extra blood making its way around your body right now. This can cause you to feel light-headed, dizzy and even faint! Remember to keep your sugar levels up with healthy snacks. You should also make sure you get and up and sit down slowly to stop a rush of blood to the head.

If you are suffering regularly with faintness it’s always a good idea to have a conversation with your GP to make sure your symptoms are normal.


Progesterone can sometimes cause you to feel very bloated by slowing down your digestion. It does this to make sure all your nutrients find their way safely to your baby as a priority.

At the same time, progesterone relaxes the your esophagus, a tube that connects your throat with your stomach. This can often cause heartburn and indigestion.

Things to do this week

It’s normal to start showing between 12 and 16 weeks.

If your bump is getting admiring comments this week, and if you were keeping it a secret, maybe now is the time to start breaking the wonderful news to friends and family.

If you haven’t already done so, make sure you enrol on your antenatal classes.

It’s also never too early for retail therapy and the second trimester is a great time to start thinking about maternity clothes!

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