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Your Body at Week 16
For now, it will seem like nothing is happening on the outside — but only for the next couple of weeks. If your timing is right and you've had sex during ovulation, your egg has been fertilized by one lucky sperm and your body is gearing up to host the blastocyst (which will soon become your baby!) that's heading for the uterus, its home for the next nine months.
So what's happening inside this week? Just after the egg is released, the follicle it came from gets a new tenant called the corpus luteum, a yellowish body of cells that occupies the space left by the egg. The corpus luteum starts to produce progesterone and some estrogen, enough of both pregnancy hormones to nourish and support the future baby until the placenta takes over in about 10 weeks
At 16 weeks pregnant, your uterus is growing at about the same pace as your baby's — aka pretty darn fast! — and it's getting to the point where you may not be able to hide your pregnancy anymore, even if you wanted to.
You're still also likely enjoying the relative bliss of trimester two, especially compared with trimester one, and will soon be able to see more of your baby at your ultrasound in a few weeks.
From the What to Expect editorial team and Heidi Murkoff, author of What to Expect When Youâ€™re Expecting. Health information on this site is based on peer-reviewed medical journals and highly respected health organizations and institutions including ACOG (American College of Obstetricians and Gynecologists), CDC (Centers for Disease Control and Prevention) and AAP (American Academy of Pediatrics), as well as the What to Expect books by Heidi Murkoff.
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