You may start to feel some pregnancy symptoms around this time thanks to the surge of progesterone and estrogen in your system, like sore boobs, bloating and general pissyness similar to PMS.

There’s also a small chance that you could experience implantation bleeding which is just a little spotting around the time you would have normally gotten your period. Only a few women experience this light bleeding and it doesn’t have any impact on your pregnancy, so don’t let it throw you.

So we’ve had zygote, blastocyst, and now embryo. Next stop, fetus!

For the record, I refuse to spell it foetus or, faetus because that looks totally made up or you’re trying to win at Scrabble.

4 Weeks Pregnant Cheat Sheet:

  • The rapidly dividing ball of cells that has now set up shop in your uterine lining is now called a blastocyst.
  • Your baby is the size of a poppy seed and doesn’t have a heartbeat quite yet.
  • You might be experiencing mild cramping, bloating, sore boobs, fatigue, and nausea.
  • You have around 252 days before you give birth.

How many months is 4 weeks pregnant?

Four weeks is one month pregnant.

How are you feeling this week? Let me know here.

Diagram of the first trimester of pregnancy with a marker pointing to week 4 of month 1.

Amy Morrison is the founder of Pregnant Chicken, a no-BS pregnancy and parenting site she started in 2010 after getting fed up with patronizing baby advice. A former ad agency creative director and mom of two boys, she's been serving up honest, funny guidance to parents-to-be ever since.

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