Hi Canimo,
I did 2 rounds of own egg ivf one of which i was 42. My amh was very good at 13 but it's quality not quantity. I was told after the failed cycle (and £10,000 lighter) that due my age my chance of success was only 5%. This is when we decided to stop throwing money away on such a small chance of success but it really is a personal choice.
I don't think IB do a guarentee that combjnes your own and donor together but i maybe wrong, you also have to qualify for the program. We never used the program but were very lucky to have twins on our 1st attempt with IB but we used donor embryos.
Good luck on this next phase of your journey 😘