Everyone is so different and i agree if you don't ask where your placenta is sitting they generally won't even tell you or discuss it with you, they certainly know because they have to for the impending birth. My first DS i don't know where the placenta was sitting but i didn't fell anything really before 23 - 24 wks and this time although it is sitting what i was told transverse, which is laying across the front of my belly i have been feeling lots of movement from the 18 wk mark. This one is much more active though, i told DP the other night that i hate to think how the kicks will be in another 10+ wks because they are very strong now and i had one the other night that almost hurt!

Just relax and enjoy.