late puberty

So I recently got on a new birth control that has higher estrogen which has helped my body a lot. It has helped with cyst migraines and period length but it has had some negative effects. On top of adding weight to my body my hips also seem to have widened. I'm eighteen but pretty that is supposed to happen when you start your period which was when I was 11. I can barely get my shorts and pants over my hips. Ow and it's because the bone there is that far out. I admit I have gained weight but only in the tummy my hips are truly wider. Is it truly possible that I had really low estrogen levels so my body didn't fully go through maturing till I got on the new pill.