What's going on?

Kelcie

So I had sex yesterday and my boyfriend said he came A LOT (it was really good sex!) and that I better make sure to take my bc pills. I then woke up in the middle of the night thinking I had started my period early and went to the bathroom, but there was no blood. My undies were SOAKED in vaginal discharge, and idk why. Is it just extra semen getting pushed back out or something? Its a whole day later, my period is now officially late and its still doing too... btw its really uncomfortable working with soaked panties so now I have a pad on :(

Has this happened to anyone? Do you know what's going on here? Thanks a ton!