Getting married July 20th and supposed to start my period the day before!!!!

Hey all

So I'm getting married July 20th and according to my 3 different period taking apps, I'm supposed to start my period that month either 18th or 19th

I have the copper IUD and so my periods every month are always mega crime scene heavy. Like soak through a super plus tampon and my pants in two hours heavy.

Any suggestions for not bleeding through my wedding dress???????