I'm not an expert here but do get a lot of YI for some reason. And yes, it can affect ttc because the cm is not very sperm friendly. When I was ttc#1 I had a lot of these and I think it was from checking my cm/cp all the time, even though I washed my hands well. Finally stopped doing that and got pg a few months later (also quit my job so the stress factor was probably gone).
If you keep getting them, treat yourself at about day 4 of your period with the 3-day treatment stuff, and have your dh also treat himself with the same cream for 5 days in a row (even if he's circed). If you are after O, you can treat yourself and dh now, it's okay to use this stuff when you are pg I believe.
I'll be interested to hear what others say!