New Depo User

hey you guys, so on the 6th I got my first round of the depo shot..later that night i had unprotected sex (not very smart yes I know 😭🤦🏽‍♀️)..but he was 100 % he pulled out (which i did see on my back, but as far as precum I’m not sure) I’ve been cramping a lot and feeling hungry and my back and head are always hurting..i was told it takes like 2 weeks for the shot to really be in your system..so could i be pregnant? or I’m hoping it’s just late cause of the shot or stress or something.