Help!

I have had AWFUL "tender breasts" for multiple days. I need help about what to do to make it better. It has been so uncomfortable that I am almost in tears if they even slightly touch anything. Also the app says I was to start my period 6 days ago, and I have been having cramps, but no cycle.. Any ideas for the cause(s)? I am sexually active, but always use protection... Really hoping nothing failed...