At 16 weeks it is 80-90% accurate using an ultrasound
I am 21 weeks into my pregnancy and i still can't feel my baby move!
there is usually about 8 weeks and 6 days of pregnancy
There should be at least be 40 weeks in pregnancy.
If you mean, How many weeks of pregnancy before birth the answer is approximately 40 weeks from the last period or 38 weeks from conception. In humans the baby is considered full term any where from 38 weeks to 42 weeks from the last period. Each individual takes slightly longer or shorter to grow a baby. Nutrition, health, heredity, and the infant are all factors effecting hte length of pregnancy. No one can scientifically predict exactly when a baby will be born.
Usually between weeks 13-28 you will generally have an ultrasound that can detect the gender of your baby. If you have an ultrasound done during the first part of your second trimester it might be more difficult to tell. It is easier to determine if your baby is a boy than a girl. In other words, if your baby is a boy, there is no doubt but if your baby is a girl and the ultrasound is done at week 13, the sonographer might not be 100% certain that it is a girl because of positioning and just the overall smallness of your child at this point.
Are Those months/weeks counted from 1st day of last menses or from the ovulation ....
if you had sex with her only 2 weeks ago, the baby is probably not yours. it usually takes 4 weeks after conception to have any sign that you are pregnant.
it last 40 weeks
All healthy, full-term pregnancies will last an average of 40 weeks.
it will be almost nine months of pregnancy