I’;ve had two successful IVF rounds. One which resulted in my son, and now I’;m pregnant again. First stim was 5 days, then a few days of coasting. Three years later the next stim was 13 days, I think. A LOT more days, different meds. I had worse OHSS the second time. I think I had better and more eggs with the 5 day stim, but then again I was three years younger.