Help me please!!

My boyfriend and I had sex using the withdrawal method. My supposed period should come two days after we had sex. It has been 10 days since we had that sex, and now I’m 10 days delayed. But this app told me I’m only 4 days delayed. Should I be alarmed? My breast are quite sensitive these past few days and I easily get irritated. Also, I feel aroused 3 days straight now. Am I pregnant?