Is it likely that I am pregnant?... I just dont know...?

From what I understand, antibiotics can decrease the effectiveness of birth control. It happened to a friend of mine who is now 7w3d with baby #2. So yes, you could be pregnant. I don't think the bleeding from stopping your BC could cause a miscarriage though. Or, it didn't in her case at least. Good luck and I hope you get the answer you want. :)