Hello I had unprotected sex on 31 aug and again on the 6th n 7th... suddenly I'm starting 2 have cramps and sore breast.. sat morning I woke up and was bleeding like I'm on my period but problem is my period always cames around the 20th of every month.. I'm just confused and worried

Worry about what? That you might be pregnant? It seems to me that you wanted to get pregnant since you're having unprotected sex... so why worry now?

So anyway, you may or may not be. You'll have to wait and take a test a few weeks after you miss a period.