Help??

I’m 16 and a senior in high school. I’m absolutely in love with my boyfriend and we recently started being sexually active. My last period began on Dec. 26th and ended around Dec. 30- Dec. 31st. I usually have a 28 day cycle, and am on birth control. The last time we had sex was on Dec. 27th, during my period.

Being that I’m so young, I’m very nervous and scared. We used condoms, and he pulled out, and as mentioned before, I’m on the birth control pill.

Today I think I had some spotting, but I’m not sure. Is there any reason to worry? Is it possible that I could be pregnant?

After researching a good bit, I don’t think I could be pregnant, but I’m still concerned? It seems as though the chances are less than 1%