Weight x Birth Control.

I’m just curious.. at a certain weight does your birth control stop working? I’ve unfortunately gained about 20 pounds recently and have noticed a few things that shouldn’t be happening while I am on my pill.

Ive been on Sronyx for 6 years now and never gotten an early period or bled on my active pill weeks until now, so I was wondering if it has anything to do with the weight gain and the hormones not being enough for the weight ive gained?