I need some opinions.

So my boyfriend I last had sex about 5 or 6 days ago... When we usually do it everyday to everyother day, but lately I haven't been wanting to do it. It's nothing against him out our sex life it's me I haven't been feeling like doing it and I feel awful. I've been feeling exhausted after a day of basically doing what I do everyday and I just want to go straight to bed, I get sick after eating a normal meal, my breast hurt and are sore, I can usually feel like I'm going to start my period right before it happens and nothing has happened I'm about 5 days late now at this point. The last time he did the duty in me was the last day of my period in May and i didn't think that it would be possible to get pregnant but right now I'm kinda thinking that I might be but I don't know.