How come after sex my discharge had blood and when i wiped there was blood? it's not and std i've already been tested so what is it? i'm scared

Normal: It can be normal to have some spotting after intercourse. Sometimes this is due to the changes on the cervix. My recommendation is that you see a gynecologist and get checked. Most of the time postcoital spotting is normal, but you need a thorough exam just to make sure. Other reasons for spotting may be due to aggressive intercourse causing small tears in the vagina.