Hello im very worried and it got swollen after sex with my boyfriend.

Patient: Hello im very worrid and scared. I had sex with my boyfriend and after i got really swollen and red & it was hurting. Then last night ( the next day) we had sex again, he was really rough but the pain went away, now im really red, its swollen, i have a yellowish white discharge . im scared that i might have a sexually transmitted disease or if its normal..