need suggestions!!

hi! just wondering if this happens to other women or if it's just me! my fiance and I are TTC but everytime we end up having sex, when he cums, a lot of it just ends up flowing out of me or landing on his penis or something. I mean I'm sure some of it goes up there but he also has a low sperm count so I assume we should be getting as much up there as possible. I think it may be because he kind of moves in and out after he cums. But I'm just wondering if anyone else has this problem or could give me any advice or suggestions. Thanks!