Has anyone done a natural (no drugs) cycle IVF?

So I’m 40 and I’ve had 3 failed IUI’s and had my first attempt at egg retrieval just before covid hit. Now that the clinic is starting treatments again they’ve advised that I do 1 or 2 natural cycle IVF’s as I only had 2 mature follicles on egg retrieval day after being on the highest possible Gonal-F dose. Anyone else had any similar experiences? Have been trying for 2.5 years, feeling discouraged...