Could you continue with your usual therapy with No.2 while speaking to no.3 just about the infertility (and, you could also talk about it with no.2 as needed)?

So, the therapy with no. 3 could either be for a limited period and intensive or keep it open-ended but not at the same frequency etc as the therapy with no. 2 (so, using no. 3 more as a consultant)?

I know stuff can't be compartmentalized like that but if you think no. 3 might be more useful for this specific issue, then it might help?

The Ts I've checked out have refused to see someone who's seeing another T who does the same sort of therapy -- so, not sure if that's an issue you'll run into.