Should I listen to my doctor?

So my periods are irregular. I stopped my birth control pills in August 2019 so we could TTC. Had a few regular cycles and then everything went haywire. I called my OBGYN this morning to ask about it and she recommends that I do a Provera withdrawal and then take birth control for three months AT LEAST to get things regular. But won’t I just end up in the same boat I’m in now?

And that’s 3 months of not being able to TTC. My father-in-law has terminal cancer, so every day counts towards us giving him his first grandchild. I just don’t want to waste my time and I’m scared he’ll pass before knowing we’re pregnant.

Please help 😞