Me and my boyfriend just had sex like 30 mins ago and during sex I started having bright red blood. My last period was Jan 9. So I know it's time for my period, but usually it comes like a week late. So I thought maybe he hit my cervix the wrong way causing it to bleed or even my period. But when I went to wipe after using the bathroom, it was very light and hard to see. Should I be worried? I've never had this happen before.