Anyone else's

Period out to get them? Ever since I can remember, if there's a day I specifically don't want my period.. It holds out till that day then starts with a vengeance. Last time I tried to go to the Gyno, my period was 2 weeks late and started the day of my appointment so I had to cancel. Here we are again, have an appointment in 2 weeks and it's already a few days late >:(