Am I supposed to be taking other supplements for my PCOS when trying to conceive?

I have read different topics on here how different women took this and that(talking about prenatal vitamins with other vitamins or supplements) include metformin to help them conceive with PCOS.

I am planning on having another baby come first of the year of January 2023,and right now I'm currently on birth control (Sprintec) to help regulate my periods. My doctor told me this past Tuesday to start taking prenatal vitamins. Which brand of prenatal vitamins is good?

When you buy those ovulation test strips. Are you supposed to test every single day until the bag is empty? I didn't do the ovulation test with my first born.

When do you think I need to stop taking my birth control because I have one more full pack to take and then I'll be out of them.

I know these questions are for my doctor,but I just needed some pin pointers to point me in the right direction.