microgestin 1/20

Has anyone hear of this or tried it? microgestin 1/20?

My doc proscribed it as she said it was pretty must the same as Estrostep (except it like taking the first week of lower hormones all the time), but that it is -a lot- cheaper. But I'm worried about side effects, Estrostep has worked well for me, minus some bloating. And other pills have made me really depressed. I hear that microgestin might initally cause some breakthrough bleeding as my body adjusts to the lower dosage, but has anyone tried this? Know anout it?

thanks!