so I had just recently got onto birth control and it's the arm implant thing, my boyfriend and I were having sex last night and he ended up nutting inside me.. I'm scared to death that I'm going to end up being pregnant not to mention, my period is supposed to be coming today or tomorrow and I'm scared it won't come. it could not come because of the birth control but how could I be so sure that it's the birth control stopping my period and me not being pregnant? what do you think the chances are of me being pregnant??