I'm pretty sure that an anterior placenta makes a difference to how much you feel. I didn't feel very much until around 18-20 weeks either, and assumed that because I had an anterior placenta that must be the cause. However, I asked the sonographer this very question on my 20 week scan and she said it was a myth, so that is just her opinion I guess! It took alot longer for my hubby to feel them too, he only just started to feel something since 24 weeks.