pregnant?

Is there anyway for me to be pregnant? My boyfriend and I were doing anal and the condom broke. He pulled out and took the condom off and put on another one but I cannot remember if he fingered me before or after that he took off the used broken condom. I'm pretty sure it was before but I'm afraid there is a possibility that he had cum on his fingers. I am on birth control and take it religiously. But typically when I take it a few hours late, like I have the past few days as a test; I bleed and start a period. However this time I have not. Will somebody please give me some answers. I want help. I don't feel any different and it's almost been a month since that happened. Just curious and need answers.