Am I Pregnant?

Cristina • Aspiring makeup artist who currently is in love, has had sexual and emotional relationship experience. :)
So I had sex with my boyfriend last night 5/21 (but I've had oral sex and vag sex with him before). It was in my car so we didn't really have access to a sink with soap and water. We had to rinse our hands with a water bottle and etc...
Anyways, so my hymen broke and blood came out. It stopped bleeding today so I know I'm not on my period yet. And I haven't had my period ALL month long! I was a tiny bit constipated when I came home. And I'm always really hungry and I have back pain. AM I PREGNANT?