Isoflavones

Has anyone tried this? 
I need some questions answered please.. 
1. Can I start these without my period as I haven't got one in two months if so when should I start? 
2. Can I take these with Maca root?
3. Can I take it with metformin? 
4. Can I take it with EPO?
5. Does this have any dangerous side effects? 
6. Have you or do you know anyone that has got a BFP with PCOS trying isoflavones? 
Any comments and advice is very appreciated! These are my current meds btw