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.
(Ultrasound waves are also used in the handheld instrument called a Doppler that your practitioner uses during your prenatal visits to listen to your baby's heartbeat .). You may have an early ultrasound at your practitioner's office at 6 to 10 weeks to confirm and date the pregnancy.Or you may not have one until the standard midpregnancy ultrasound between 16 and 20 weeks.f you'd like to find out whether your baby's a boy or a girl, you usually can at the midpregnancy ultrasound (16 to 20 weeks), unless, for example, your child's hand is covering his genitals during the scan.