My first pregnancy I did daily yoga, meditation, ate super healthy, no booze, had massages, acupuncture - the works.
Lost that pregnancy unfortunately, and then went straight to another transfer - so my second transfer was preceded by drinking every night, eating like ****, stressing and crying a lot.
I'm 26 weeks with that little kicky man
What I find helped me deal with it mentally and helps me when thinking about friends on the IVF journey, is what my FS said - every pregnancy, every embryo is different.
Different sex maybe, different combo of genes, different timing... I have a lot of faith in that, it seems from the success rates of both IVF and natural fertility, once you've ruled out anything practically that might hinder success like blocked tubes or endo, its about the numbers game and hoping you win the lottery (which frankly sometimes seems like it would be easier than getting pregnant through IVF).
Thats what helped me at least in the first trimester - just telling myself that this was a totally different little creature with its own unique ability.
hope that helps someone.