HELP!!!

so about a month ago i started birth control. then 5 days after that i had unprotected sex but it didn’t look like he came inside of me, it was outside of me. then about a week after i started having brown spotting and bleeding for about 2 weeks when i was supposed to get my period. i am still having cramping now but it’s more on my left side. and i’ve been feeling tired. could this be because i have to get used to my birth control or could i be pregnant?