I think there are three separate issues here, so bear with while I try to sort them out.
1) It's normal to have a bit of bloody discharge just before or after your period, and yes, it's normal for the consistency of discharge to be a bit different (thinner, slipperier) after sexual arousal.
2) If your boyfriend had a condom on for all of intercourse, and the condom did not slip off or break, your risk of pregnancy is very low to none.
3) You can get pregnant at any time during your cycle, even when you're on your period, so you probably shouldn't be trying to figure that into your pregnancy risk.
Hon, what do you mean when you say you're not sure if your boyfriend wet in you?
Why scream and shout when you know it's true?
Why fall in love when there's better things to do?