Question

My boyfriend and I were drunk one night and he came inside of me. But I was just starting my period that day (very light). Next day my period was more normal and quite a bit heavier like normal but we had sex again and he came In me again. This all happened on Halloween. I did my research and some websites say there is no way you can get pregnant on your period and others say it is your most fertile time...so...? I took a pregnancy test but it says I am not pregnant. But I think it was maybe too soon? Could I be pregnant?? Please help, thanks!