All transvaginal probes have been cleaned and sterilised according to recommended protocols. First trimester yolk sac. It's an estimated due date ; the vast majority of women don't deliver their babies the day they're due. That's why doctors often need two consecutive scans to diagnose miscarriage. Assess the uterus and ovaries. It is important for women having an ultrasound to be aware of this small, but real risk of false positives.
Your doctor may be concerned about you having more than one baby for example, twins or triplets if your pregnancy was conceived with the help of clomiphene or IVF, you have a family history of twins, you have severe morning sickness or your uterus seems larger than expected.
First Trimester / Dating Ultrasound
Karim, J. It may also detect a serious problem with either you or your pregnancy, some of which require further investigations or treatment. Assess the number of babies.