Has anyone had fsh levels checked?

I'm cd 1 and i have to go get blood work done on cd 3. My Gyno said they can't really do anything else since it hasn't been a year but I think she wanted me to at least get some answers. I'm only 25 and we conceived before. I'm just confused why I would be tested for egg quality. If anyone has some knowledge about it I would love to know. I'm guessing she just picked standard tests so I feel like we are trying something