HELP!! I'm so confused. my period is three days late now. took a pregnancy test this morning and came back negative. I'm never late. no sudden weight gain or loss to mess with it, no stress (actually most unstressed I've ever been in years), no thyroid problems. I have no problems like pcos or endometriosis.. We've been TTC for a year now, having issues because he has a low count. any other ideas as to why my period is so late??