Pregnant?

Recently I was intimate with my boyfriend and he and I tend to be safe, considering our situation. We always use a condom and if he’s about to ejaculate he does it outside. Although around the end of last month I had relatively heave sporting but not heavy enough for it to be my period and this month I’m about a week late and I took 2 pregnancy tests and they both came out negative..I don’t entirely know what to do though.