What Could Cause Pain And Little Bleeding After Having Sex?

Hi I'm a 17 year-old girl. I had sex with my boyfriend and I sat on his penis and the penetration hurts. Thinking it was just because the pathway in was not right, we continued. After having sex, there was a spotter of blood (very little) on my panties and when it was painful when I urinated (just when I was about to finish peeing). That night, the frequency of my urination has increased and most of the time, it was almost always only a small amount of pee. Next morning, I drank lots of water and when I urinate more liquid, it didn't hurt that much but there was still pain. It's been 2.5 days and it still hurts when I pee. I spot some blood (very faint) in my pee. Sometimes (I think 3 times?), there's a white discharge from my vagina. Feb. 9-16 was my last menstruation and we had sex on Feb. 19. He has been my first and only partner and so am I to him. We both do not have any history of STD's. This is the 5th time we had sex and it only occured now. I think I didn't break my hymen in the past because there wasn't blood in our first sexes. Is this because of rupture of the hymen or some infection?