Maybe paranoid.

My boyfriend and I have had sex with a condom each time and it hasn't broke once. We have been in a relationship for only a couple months, and I have had no prior sexual activity. The first two times, the condom kept rolling off a bit during sex but never broke. Another time he pulled out and the condom was still partially inside me, but it wasn't not broken nor did he climax and we stopped completely after that. Do I have a reason to be worried? I also might add that I feel like I'm gaining weight (bloating mostly) and I have been experiencing light-headedness. I am also two days late on my period, but it's never really be completely regular. I just can't tell if these things are happening because of my holiday eating patterns, finals week,me psyching  myself out, or a reason I should be more concerned about. Feed back would be greatly appreciated! X