So my period is pretty regular (was on the pill for 3+ years and just got an IUD so well see if that changes) but near the end of my period when it starts to lighten up, I notice there's blood on only one side of my tampon.... its so annoying because it's heavy enough to warrant a tampon but hurts to remove because I'm completely dry on one side. Does this happen to anyone else and does anyone know why it happens??