Help please!!

Im 10 days dpo and due my period in 3 days. But i always come on before im supposed to , like a week early but havnt this month and no period signs. Me and my partner had unprotected sex on the 18th august and he finished a little inside me. Ive had really sore nipples and cramping below my belly button and feeling tired all the time. I have had creamy discharge a few days. Advice please