: "I use to have irregular periods but i got on the pill to control them. And month later i got off and i didnt have a period for 3 months, this past nov. I got it on time but i havent recieve my period for dec. Is there a possibility i may be pregnant?"

If you had sex after November period, then yes, it sounds more like you are just very irregular and taking the pills for one month confused your system even more.

ANY time you have penile insertion there is the possibility of pregnancy. So, if you are sexually active you could be pregnant. But going on and off birth control meds can play havoc with your period.