I skipped my period! Could I really be pregnant?

Ok first off I would like to say I've not been smart. I'm currently 15. Me and my boyfriend have had sex a few times, each time he has used a condom but I'm not on the pill or anything like that. We broke up for a while in May, the last month I had my normal period. I usually get it either the last week of the month or the first week. I had it normally then. We never had sex in May then I skipped my period in June. The normal beginning with a brownish red "discharge" showed up but nothing after that. The one thing the worries me is that was the same day that we had sex again. But he used a condom and he didnt even cum inside me, we were really careful. I had my first period when I was in 5th grade and it lasted two days but then I didn't get it for another two years. I haven't gotten it yet but its still a little early in the month. Could I really be pregnant or just irregular? My boyfriend is going to hget a test soon but I wanted to know other people's opinion.