9 months ttc and nothing!

i am 36 and have been ttc for 9 months

we have gotten nothing. not a chemical. nothing at all.

i’ve seen two fertility docs who both diagnosed unexplained infertility.

all my blood tests are normal. i ovulate every month which has been confirmed on monthly opks and several times on ultrasound. husbands sperm is also normal.

the only thing that’s weird are my cycles. some are 20 days. some are 28. some are 36.

what could be causing that? the fertility docs didn’t seem concerned and both said just keep trying.

i am becoming so depressed from negatives every month. does anyone have any advice or ideas?