Feeling pregnant?

Lately I've been feeling pretty pregnant, so to say, last night while having intercourse I started feeling like I was going to vomit practically as soon as it start. And after wards I asked my partner, cause I didn't wanna ask in the middle of it, if anything was feel different down there, and he said yes, that it felt like when he would try to go deeper it felt like something was stopping him, like there was a wall up or something. I'm just wondering if I should be looking for more signs, or just blow it off. Help?