Missed period

Fantasia
last Tuesday I decided to start my bc pill so I can stop my period before it came on Thursday, i read that bc pill doesn't work that fast so after Thursday I jus stopped taking them but I noticed my period still didn't show... I had sex with my ex on saturday May 28th and we don't use condoms so he came in me 3 times but he always do and I never got pregnant so we don't mind it anymore.... A Week and a half ago I was peeing like every 5 mins, sleeping in class and tired more, hungry more but nauseous too, headaches, and I got a head cold all of a sudden.... but since last week all that went away and I jus been having cramping from Thursday of due period to today..
Could I be pregant ? Or is it in my mind ? 
( I Don't use birth control, I jus found an old pack unopen and decided to try to take it for 3 days to stop my period!!)