Mystery

Lauren

Okay ladies I have no idea what could be wrong here... my period is extremely regular and is now late by 5 days... I haven’t had sex since the first week in December so I know I’m not pregnant... and I’ve had my period 3 times since then... none of my daily habits have change... I haven’t started any new medication... I’m not on birth control... I haven’t been unusually stressed... what could this be? What could cause my period to be this late?