Coffee & TTC / Pregnancy

Hi! I have recently switched to decaf coffee because after slowly consuming less I am at the point that I'm cutting caffeine for the most part!

So my question is- has anyone heard any advice on drinking decaf coffee while TTC or during pregnancy?

I have read a few things about it being harmful due to chemicals used to make it decaf but haven't found anything definitive. Any doctors or nurses or anyone with insight on this?