Am I pregnant? Very scared.

I had sex with my boyfriend about a month ago when he was home visiting from college. We used a condom that didn't break, he pulled out and I was taking birth control correctly (everyday same time). He lives in a different state than me and so after he left to go back to school, I kind of just stopped taking my birth control. I am currently bleeding and this is about the time I get my period each month. It seems a few days later than usual but it has been known to fluctuate. I have only been bleeding for 3 days and on the third day it's very light. I did not take Plan B or any other emergency contraceptive. I do not really know my cycle length. I have extreme paranoia when it comes to getting pregnant. Can someone please reassure me that everything is okay. (Yes I know that I can't take my birth control off and on for it to work effectively)