pill break through bleeding

April
So I've been on the pill since I was 16 due to PCOS. I went off it in 2015 when my husband and I started trying to get pregnant. Fast forward to this year a month ago I started the pill amethia after I was given the go ahead from my ob when my son was born. I've had a decent amount of break through bleeding. It's not every day and it's not always a lot. Some days it feels almost like a lite period. I started the pill before my post partum period. I never got one yet though all my bleeding from after birth had stopped. I was wondering for all the ladies on the pill how common break through bleeding is and if I should be concerned. I know my dr told me it doesn't affect the reliability of the pill but it just worries me how much I'm bleeding. The package does say it can take up to three cycles to stop. Not sure how much bleeding is too much.