help! pregnant or not?

Me and my boyfriend practice safe sex. We use a condom and I put it on properly (always squeezing the tip). But sometimes I get kinda freaked out after he ejaculates. Sometimes I might think my discharge is his at the base of the outside of the condom. Has anyone experienced this? My period is late by 2 days and I have been experiencing some pregnancy symptoms (sore breasts which I usually don't have but my boobs might just be growing, eating more, cramps that occur on and off, And my boyfriend also thinks I'm sick but I don't feel much, I'm also more tired than I usually I am) my period might also just be late OF exams but in not stressed at all