About 14-15 weeks into pregnancy the fetus is about 9cm long so it was conceived 12-13 weeks ago.
At thirteen weeks the fetus is fully formed and as long as your doctor knows you are pregnant when prescribing he/she feels thst the benefits outweigh any problems.
approx 13 weeks
About 13 weeks, give or take a few days.
13 weeks
At 13 weeks gestation, a fetus typically measures around 2.9 inches in CRL, which is the length from the top of the head to the bottom of the spine. At this stage, the fetus has developed all major organs and body systems, and its limbs are more defined. The fetus can make movements, although the mother may not feel them yet. The skin is thin and transparent, and the fetus is starting to develop fingerprints.
A baby should weigh about 3 lbs in week 30. I had an ultrasound at 32 weeks and the baby weighed 3 lbs. My doctor said its a little small but nothing to worry about.
At 6 weeks post-conception, the fetus looks like a little blob - the spinal column has started to stand out and you might make out the eye sockets starting to fold back in. Otherwise, it looks like any vertebrate fetus and is not visually identifiable as human.
about 13 months
10.1
3 months
around 13 weeks