When did your RE have you start progesterone in a fresh IVF cycle?

Me

I had one successful cycle back in 2017 and am convinced they had me start progesterone right after the retrieval. I did 3 more unsuccessful cycles with one of them looking so promising because the blasts were perfect. All of those cycles my RE had me start the day of embryo transfer. I am wondering if this is why they did not work out. I am 42 and will do one last cycle and just want the best shot at it. 💕