At three weeks pregnant, it is time for the sperm to meet the egg. As we mentioned in week two, your partner’s sperm goes on a very difficult journey to fertilise your egg, but if it’s made it and you’ve conceived, this is the week when your baby will first start to form. What symptoms do you need to look out for and what advice is helpful at this stage?
How big is my baby at three weeks pregnant?
Right now, your baby is a ball of around 100 cells about the size of a pinhead. This is officially referred to as a blastocyst.
What is my baby doing at three weeks pregnant?
Within hours of being fertilised, your egg will start to travel from your fallopian tube to your uterus, and the fertilised egg (now medically referred to as the zygote) will divide into 16 identical cells. This journey can take up to six days, so implantation probably won’t happen until week four. The inside of the cell mass will become the embryo itself and the amniotic sac. The outer cell mass will become the placenta.
Common symptoms to look out for:
3) Metallic taste
A common side effect of pregnancy is a metallic taste, caused by the changing hormones in your body. These side effects will usually settle in the second trimester
, although this can feel a long way away right now, so try sipping lemonade and other citrus juices to try and help.
What is my body doing at three weeks pregnant?
From the outside, it probably won’t feel like much is happening right now, but if you’ve timed things right, that precious blastocyst is starting out on its journey and heading for your uterus. Just after the egg is released from the follicle it came from, it will be replaced by a yellow group of cells called the corpus luteum. This, in turn, produces enough of the pregnancy hormones progesterone and oestrogen, to support your future baby for the next ten weeks, until the placenta is ready to take over.
At this point, you still probably won’t get a positive pregnancy test, but in the next few weeks, once the blastocyst has made its way into the uterus, the cells of the developing placenta will make human chorionic gonadotropin (hCG). This surges in your first trimester and tells your ovaries to stop producing eggs and start making more progesterone and oestrogen.
What should I be doing when I'm three weeks pregnant?
You need to make sure you are eating healthily and getting the right nutrients and vitamins when trying to conceive or during the early stages of pregnancy.
Up the protein
Your baby will need extra protein to help it grow, so try and make sure you get three servings of protein a day in these first few weeks.
Make sure you’re getting enough calcium
It might seem obvious, but if you’re not getting enough calcium in your diet when you’re pregnant, your baby will start taking it from your bones! Now’s the time to up the intake – foods like Greek or frozen yoghurt will help. If you’re still struggling, it might be worth looking for a calcium supplement.
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