letrozole natural ovulation

An

so i had miscarriage in june

last cycle I went to obgyn to check follicle growth

i went on a wednesday it was 13mm

then went on saturday and my follicle was 16mm ( cd 19 )

i actually got positive opk that night so 16mm

cycle after miscarriage is very long around 30-35 days

doctor says i can take letrozole 2.5 to help with the follicle growth if i need

anyone took letrozole even when they are able to ovulate alone ?