Pre-ejaculation?

I had sex with a condom and he ejaculated then afterwards I gave him oral sex and since he didn't ejaculate we had sex without a condom. He pulled on like 3 seconds before fully ejaculating. On this day I had a 33% chance of getting pregnant. Ever since that day I've been having cramps and different vaginal discharge. I'm expecting my period on the 30th I had sex on the 15th. It is now the 25th and I still have cramps.