Mild cramping , sore breast!? What's going on!

Period is due in 1 week . 3 days ago I started feeling sore breast mostly on the side , and mild cramping on and off for 2 days . I'm not so sure if this can be an early sign of pregnancy or what! (TMI) had sex on the 28th of last month , he ejaculated on my vagina not inside . But I'm thinking some could go inside , I wipe it off about 15 minutes later , he peed a little then 10 minutes later he penetrated. That day I had a very watery discharge that it felt like If I peed on myself. Can it be PMS symptoms . Any ideas ?