help!!! could I be pregnant ??? Update !!!!!!!

My period ended on the 7th this month, and I had sex on the 9th and I've been cramping ever since, pulling, stretching pains on both sides,  my boobs are not sore or sensitive, but my back hurts like a burning pain that almost feels like my boobs the ones burning, I have also been getting hot flashes constantly, My head has been hurting non-stop and I get so nauseated, I have been under a lot of stress at work lately so I don't know if that has anything to do with it.  I feel so bloated And I've been peeing a lot, like 11 times a day, almost every hour, even when I'm laying in bed at night I cramp, like if in om my period, I do have noticed my bra is fitting me tight, but I don't know if it's from where I've been gaining a little weight, my nose is really stuffy too. And I just feel tired and sick but I don't know what's wrong, could I be pregnant ?? I know it's too soon to test.