Please Help Im Scared :(

I recently had unprotected sex, but only for a couple seconds because I didn't have a condom. I know it doesn't sound like a big deal, but now, 4 days later, there is blood coming from my vagina. I'm not on my period, because it just ended the day before I had sex... It bled right after sex, but it was my first time having sex so I figured my hymen just broke. I'm terrified of getting pregnant because I'm way too young.. I'm still in Highschool and my parents would kill me... Yesterday, I felt as if I was going to throw up, then it felt like someone was literally punching my stomach.. I thought it was because I was hungry but when I tried to eat, I got full after only a few bites.. I'm really scared, what's wrong with me?