37 and ttc

Brandy
I am 37 and ttc my husband and i have 3 kids 17, 13, and 6 . We have been trying for a month and AF came yesterday May 29 . We have never had trouble with any of the other 3 . Just wondering if anyone has had any trouble tryin to ttc in their 30's we also did clear blue ovulation kit as well and no luck conceiving prayers would be wonderful