Estrogen Patch/Estradiol

I had a D&C procedure/surgery this week because part of the placenta was left behind post delivery…. While I was asleep they prescribed me on estrogen patch and a pill that fights infection. Do you know why I would be on Estrogen or if it’s safe to breastfeed with it? I’m feeling off today and I don’t know if it has to do with it but I’d like to know why I need this. (Blurry vision and speech is off).