So about 4 weeks ago I had protected sex with my boyfriend, and this week on Thursday I was supposed to get my period but I'm 3 days late. Also, a week ago on I believe Wednesday I had a light amount of blood. I have had naseous and back pains but that's about the only sympotoms of my period that i've had. When my boyfriend and I had sex the condom was a little big but it didn't slip off or anything so I didn't really think there was an issue, but I am a little nervous. What do you guys think?