Gettin it done at 31!

Miss
My husband and I have been together 7 years and we are 31 and 32... as of 2 months ago started to actively TTC. Figured out my cycle is 30-31 days and have done the BD at least 2-3 times during the fertile window... At least I hope I'm calculating everything right - seems to all be inline. I'm taking pre natals and praying like crazy. Any tips for an "old" mom trying to conceive?!