help I don't know if I'm pregnant or my periods about to start

So I had sex with my boyfriend the week before last which was Friday, Saturday ,& Sunday when my ovulation was high. My period suppose to come on the 15of this month but my boobs been hurting every since the 4th of last week . My discharge has been watery and really white I don't know what my situation I need help . This the first time this has happened.!!!