I just got done with my monthly period yesterday which lasted a couple days longer than normal which I just figured that was because I missed one of my birth control pills while I was on my period. Once I realized I no longer had my period my boyfriend and I had unprotected sex. During the day today nothing was out of the ordinary but tonight I noticed I was spotting which is not normal for me. Should I be worried about this and why am I spotting when I normally don't?