Sounds odd but i was told the rocking motion of sex sends baby to sleep so hense no movement after sex. The pain might be baby pushing on something or lying funny and causing u pain. Ur appendix is a very bad pain that starts at the top, moves to the left... goes off then comes back 10 times worse on the right down by ur hip bone! Try getting baby to move by going on all fours, gives baby more room n see if the pain stops. If no better ring ur doc for advice x
I sometimes got.pain after sex but never this bad. :/ it feels alittle.better when I put a little pressure on it with my hand . After sex I didn't feel the baby move at all through out the night, so that worried me as well. But my baby moving a little today. I have an app with my O.B Monday . Maybe i'll stick it out till then and if it gets any.worse over the.weekend ill go to e.r.
I always have a lot if uncomfortable aches and pains after sex. It lasts all night but usually is gone by the mid day. It seems like a lot of women have said they get achy after sex so I hope that eases your mind a little :) But if its hurting really bad Id check with your doc just incase.