My placenta was anterior with my second pregnancy. It wasn't with my first and I can honestly say I didn't notice any difference.

I felt my son moving at about 14 weeks, although I guess I would say the movement didn't seem quite as frequent early on until he got a bit bigger. But by 20 weeks or so I couldn't say it was any different to my daughters pregnancy. I have heard many people say though that they don't feel much.