My period is about 5 days late as of today. My boyfriend and I had sex with a condom during the last day of my last period ( period was still going on that day). If it was during my period, does that mean I wouldn't be pregnant? But then why am I late? My periods are usually on time, only like one or two days off. Also, I usually NEVER exercise at all, but around 3 weeks ago, I randomly started jogging for about 15 mins every day and do about 30 sit ups daily. Would that be the reason why my period is late? Please help.