If you are feeling very overwhelmed at the moment, I would consider delaying for a month and using the month to really focus on your mental health with therapy/meds/whatever works for you. I also struggle with depression and for me active treatments really exacerbated it - in addition to the stress of the process, for a lot of people (including me) the hormonal swings can also really trigger/exacerbate depression. I have taken a few 1-2 month breaks at various points in my IVF journey when my mental health wasn't up to active treatment (I am in fact currently in one), and it has definitely helped me.