I was on my period, it ended, I had sex with my boyfriend, then the very next day I started bleeding.. it got heavier and heavier with each day, heavy flow and clots.. now I'm on my second week of the bleeding, I have horrible cramps, and terrible mood swings. Im 22, and I don't know if I should be worried. Please help

You need to seek medical attention as soon as possible. You may very well be having a miscarriage.