I am 18 weeks. fetus has not stopped excessively moving for over a week. it seems to get worse when i move positions. can this result in stillbirth?

Baby moving...: After 17 weeks of pregnancy it is usually when you become aware of your baby moving inside of you. They can move a lot and it is not a sign of miscarriage or stillbirth. The opposite is true. Once you start feeling the baby moving, if it stops moving that is a dangerous sign. If you experience vaginal bleeding, severe pain, then those are also red flags and you should see OB.