I had sex on the last day of my period. In the middle of it, the condom broke and we decided to stop right away. Two days later, I started experiencing mild bleeding and now (about five days from the last day of my period) I'm having cramps. I usually don't have cramps like this unless I get my period and I'm pretty sure this isn't my period..even though the blood seems to be the same kind. 

Could I be pregnant? Some sources say that if I have longer cycles, it's unlikely that I can get pregnant if I have sex on the last day. My last cycle was 33 days which seems to be a lot longer than most... Also, my boyfriend didn't cum and we just stopped in the middle of it. 

I'm confused about why I could possibly be bleeding. I researched and some sites say it could be implantation bleeding..but pre-cum doesn't have sperm and looking at my ovulation cycle, I'm not supposed to ovulate until at least September..

Can someone help please? Thank you.