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A: Babies grow tremendously in the later stages of pregnancy -- they usually double in size between 28 weeks and the time they're born. But it's rare that a baby is growing too fast; more likely, he's just big for other reasons.

So at 2 weeks pregnant, you're actually not pregnant. But you may be close! If you're preparing to try to get pregnant, keep your eyes open for signs of ovulation and do that thing you do to get pregnant have plenty of sex around the time you expect to ovulate.

Last menstrual period (LMP): Pregnancy normally lasts about 40 weeks from the first day of your last period. Accordingly, the number of weeks that have passed since indicate what week of pregnancy you're in. To work out your likely due date, count 280 days (40 weeks) from the first day of your last period.

The first trimester of pregnancy can often be the hardest. Pregnancy hormones, extreme fatigue, nausea and vomiting, tender breasts, and perpetually needing to wee make life growing a human no easy feat.

2 Weeks PregnantAt two weeks pregnant, so to speak, your period may be over and ovulation may be just days away. At the end of this week, if you have sex, egg and sperm can meet and conception can take place. If this does happen, your uterus is about to become a very busy place!

Early pregnancy symptoms such as tender breasts, tiredness and feeling sick, are easy to confuse with signs that your period is coming on. For most women, the first sign they notice is a missed period (Murray and Hassall 2014).

A fetus usually gains the most weight during the third trimester. They will gain an average of 5 lb and grow around 4 6 inches during the third trimester, according to the OWH.

The second trimester is a time of rapid growth for your baby (called a fetus). Most of the brain's development begins now and will continue after your baby's birth.

Baby still only measures just 2 inches long from the top of the head to the rump about the size of a prune. Most of that is the head, which makes up about half of your baby's entire body! In a few weeks, baby's head and body will become more proportional.