Is micronor effective if you're over weight?

[imitchy]

So I've recently started micronor and have zero side effects. Before this I was on a combined pill and had every side effect possible: nausea, fatigue, migraines (with aura ), no libido, sore breast, bloating, ect.

I've heard that if you're over 150lbs micronor isn't as effective. Since I'm over that weight with no side effects I'm a little concerned.