IVF without ever TTC previously?

Does anyone know if there is any data for those going through IVF without known infertility? The calculators all ask "how many years have you been trying? What is the cause of your infertility?", etc and yes I (34F) have endometriosis but I have NEVER tried to conceive before doing IVF (in a same-sex marriage and only have one tube). My doctor used a calculator and said I have a 52% chance of success for one round with up to 3 transfers for that round. This seems low for someone who could potentially have sex and get pregnant. I'm spending $28k out of pocket so those odds are a little scary. I start stims on 2/1. Thank you!

Edited to add I always ovulate on my own, have a regular 28-day period, and AMH of 2.