could it be my period?

So me and my bf always use protection. Before he even ejaculates he pulls out and finishes. Just in case there is a hole or something wrong with the condom. *may sound weird,sorry. The past week I have had really sore breasts. Lower back pain *but not too often, maybe couple times* cramps. I feel sick while Im at work, but I think it's because the lack of sleep. I work 15hour days. 2 jobs. Im lucky if I get 5 1/2 hours of sleep. Im never getting the sleep I need. I just started my new job about 2 months. And havent had a good period since I started it. I use to exercise every single day, but now I hardly do. Im lucky if I go to the gym on the weekends. So I'm thinking I'm getting my period and just taken a while because I have such a messed up routine. and my routine changed so quickly. Or, is it that Im pregnant?