I had an anterior placenta with DS2 and 3, I didn't feel movement until pretty late maybe around 20 weeks with DS2 (although that was a long time ago so can't remember to the date) I remember being worried because I felt DS1 months before. No one told me about anterior placentas back then. DS3 I felt at about 14 weeks I think, but very faint still then. There have been a lot of threads on here about this in the past so I'm sure you'll get lots of reassuring answers from others as well.