It can be one of two things either you are not far enough along for the baby to appear on ultrasound or you have miscarried, which in that case you would have been made aware of when they did the ultrasound.
did you mean to say "negative"?
you can have a small belly during pregnancy that might mean you will have a small baby
It means that the baby is facing the mothers pelvis during pregnancy or labor.
You should ask your doctor. But it may be that the baby's placenta is low in your uterus and covering the cervix. If this is the case this link may help.
The baby will not be seen in the early weeks until it is big enough to be detected. Often the baby is younger than dates suggest especially if you have a longer than usual cycle and so will not show up until later than anticipated.
Biparietal diameter (BPD) is the diameter across the developing baby's skull, from one parietal bone to the other. The measurement is useful in dating the pregnancy and estimating fetal weight after about 13 weeks of pregnancy.
donoo
Unfortunately no....... they take an "educated guess" which is based entirely on the measurements taken during the ultrasound. You will probably find also, that as the baby grows, the estimated "date of arrival" will also vary upto a week or so either side, because the speed of growth of the baby can differ from one pregnancy to the next and they use these measurements to determine this. The closer it gets to delivery date, the easier it becomes (supposedly!) to determine the exact age of the developing baby. actually the above answer is not accurate i have been a nurse in labor and delivery for 4 years.it depends on when the ultrasound is taken in early pregnancy it can be no more than 5 days off. in late pregnancy close to deliver it can be up tp 3 weeks off because after 20 weeks all baby grow at there own rate. by early pregnancy i mean between 6 and 12 weeks. what most women dont know is everything goes from your last period including ultrasound so in order to find conception date from ultrasound you have to take off two weeks because if you count back even from an ultrasound you will get the first day of your lmp or when the first day should have been if you are irregular. if the period you had was false they will be able to tell you
If you are sick while pregnant it does not necessarily mean that there is something wrong with the baby, it can just mean that you are just suffering from a regular sickness.
The baby is probably engaging/dropping. getting ready to be born
if it is your 1st pregnancy, then it is usual (if it is not your first baby and you didn't get pains that is fine, every one is different) If it is your second baby it would be smart to get it checked out by your doctor. Doctor.
It means that you are beginning labor and you could have the baby at any time.