wikiHow to Raise Low Blood Pressure. Low blood pressure â often defined as lower than 90 mm Hg systolic or 60 mm Hg diastolic â is a common medical condition with a variety of causes, including pregnancy, heart problems, some severe infections or allergies, blood loss, and even dehydration.
You may have an ultrasound between 18 to 20 weeks to evaluate dates, a multiples pregnancy, placenta location or complications. It may also be possible to determine the gender of your baby during this ultrasound.
An early scan is particularly important however, if: Your doctor might ask you to have multiple scans in your first trimester if: At five weeks (three weeks after conception). The ultrasound doctor may see a small gestation (pregnancy) sac that looks like a black hole because it is filled with fluid.n these early weeks of pregnancy, your baby is too small and low in your abdomen to be picked up by an abdominal ultrasound scan. A vaginal scan is done by introducing a probe into your vagina. It can pick up a better image of your baby.