What kind were you on?
I went on a mini pill while nursing to help but I cannot remember know which one it was. I was feeling CRAZY awash in all the hormones from pregnancy and then nursing. I didn't gain weight on that. I actually was down to pre-pregnancy weight within 3 weeks of birth. What started the gain was toddlerhood!
There's a thread around here for BCP for PCOS people -- make sure you get the right type for you if you decided to try it again.
http://www.3fatchicks.com/forum/pcos...ills-pcos.html
You can also check in with a naturopath or hebalist to see if there's other remedies or if progesterone cream instead is better for you. It depends really on why you are bleeding.
GL!
A.