Intercourse at beginning of period

So me and my bf had sex for the first time while I was spotting and we did not use protection. Once he and I were "done" my period came on a few hrs later. That was two weeks ago and my period is gone but I've been feeling nauseous and my chest has been feeling heavier and more sore than usual. I'm not scheduled to ovulate until next week and this app is on point with my body schedule.... Ik its super early to tell but is it possible to get pregnant right when ur period comes????