We had anal sex which is a first for both of us because we had been virgins and couldn’t really get condoms. We did this about three times over the span of 3 days. the first two, I came inside her anal passage, while the third one I came on the top surface of her rear. My girlfriend was wearing a tampon, as we did this during the last few days of her period. I have been in a terrible mood all week because I’ve been worrying- is the chance of pregnancy very big? Please help.