First timer

i'm not big on the whole sex thing, but i was curious and didn't tell anyone. so i fucked this dude and after i noticed i was spotting which i knew was normal cause it's my first but then i believe a week later i started to get this tingly feeling and slightly itchy so i'm a little worried about what's wrong. i asked a friend and her first response was did i pee right after, which i didn't! can someone explain why this is happening? do i need to get checked for any diseases?!