Can you help us to get information?

Hello everybody! We are young couple from Russia/Ukraine. There is no a lot information about endo on russian language so we have decided to ask here.

My wife have endo for about 2,5 years. About a year ago she had lapro. After that we started a course of medications – Duphaston. It worked someway, pain became lower and she felt good. After 6 months we started to try pregant with no result.

Now we use Visanna (and nothing else). We want to try pregant in 1 month after finishing Visanna.

So i have several questions:

1) I read that one medication is less effective then several of them

2) Where i can read about the right strategy to pregant with endo? And the right timing after using medications?

3) Any risks for embryon?

Thank you and sorry for my english )