Have you thought about possibly taking a period of time off work, like several months, just to come to terms with being you, and embracing a different life , to come to terms with not being pregnant, rather than just going back to your previous life (FT work, no pregnancy, no maternity leave) And during that time, enjoy life with the puppy, get him settled, possibly start getting him used to day care for some days (I'm a elderly SAHM but my puppy still goes to daycare one day a week, just because he likes it there
and I need that time off
)
Sounds like part of what you are craving is a change of pace. Puppies are full on, like babies, but it is so different from work out of the home.
Disclaimer: I suffered from infertility for several years before having my three (through IVF) and at some points I should have given myself more time to just "BE". I think it would have helped conception, don't flame me for saying that. I think we put a lot of pressure on ourselves to do everything right, and to a timetable, but nature doesn't oblige. And it makes us miserable.
You are worth a puppy, and the time to enjoy a puppy, and a break.
Set against the cost of IVF and the cost of parenthood the money becomes less important.