Women conceive in famine and war, I'm honestly not convinced that stress plays a part. I've had 4 IVF with ICSI treatment and to suggest we were unsuccessful because of stress is hurtful. If a couple need IVF there are other factors influencing the outcome. Are you having IVF user? I'd be happy to discuss the craziness it can drive you to. I followed all the boards and remember becoming practically superstitious about the protocol.
I disagree. I think genetics also plays a huge part. Some women, especially non-white european women, are known to have a trickier time with IVF. If stress really was a blocker than no Indian woman (where everybody is highly stressed, living with in-laws, expected to be beautiful and work full time while running the whole house too) would ever get pregnant.