There are several early symptoms of pregnancy. The most common symptom is a missed period but your menstrual cycle can change for several reasons, not just pregnancy. Your first step is to confirm your pregnancy with our free pregnancy testing service. To get the most accurate result, you should wait at least one week after your missed period. After a positive pregnancy test, it’s time for an ultrasound. You need an ultrasound to verify how many weeks you’ve been pregnant and whether or not you’ve miscarried.