TTC BABY #3

My fiance and I have been ttc for about 9 months now with no luck, I am beginning to worry I already have 2 my kids youngest is 7 my fiance and I have no kids together I've always wanted a big family and I want to have his baby but we cannot seem to Concieve I am really really hoping this app helps me to do it.. Anyone have any helpful suggestions for he and I?