Help?! Is it period or ?


Hello, so...

My boobs are sore like fuck, although my period should come in ten days. I had unprocted sex with my bf this week two times,and the last week once, but everytime he came in my mouth.

I took a test today (we did sex basically last tuesday, last sunday and on monday) and it turned out to be negative.

Plus, these days I did some cardio and aerobic (a thing that I do it very rarely) so could be just sore?

Should I be worried? What do you think?