Doggy Style

Last night the guy I hook up with and I tried Doggy as a compromise (he's been wanting anal but I'm just not ready yet). We both really like doggy but I have to spread my legs quite a bit to be low enough for him to get at me well and it really hurt my hips to have him pounding into me like that. I also noticed that by opening myself up like that I was really prone to getting air into my vagina and the first time he pushed in I queefed because of it. I'm worried mostly about the air because I've read that it can be dangerous and it did make me feel kind of sickly. I'm also late for my period and don't know but what I may be pregnant and if that's the case, I don't want to do anything that might interfere with that. Will anyone who knows more about any of this please give me some advice?