SO says he "feels" something

During the past 2 or 3 times we've had sex, it's been a little uncomfortable for me (not painful, just a weird feeling). And last night my SO said he felt his penis hit something. I'm guessing it's my cervix? I've never had this happen before. I hate the fact that sex is a bit uncomfortable because we're TTC. Does this mean anything about where my cervix is sitting, or could I already be pregnant? I'm just not sure. Comments please!