TTC at age 40 after DH had VR

So we are on our 4th month of TTC after DH had a vasectomy reversal. DR said fluids looked good at time of surgery. My cycles are extremely regular, with all the appropriate signs of ovulating ( EWCM, + ovulation tests, drop in BBT, etc)   My OB said blood tests looked good for success & we do the BD on all the days suggested. I'm trying not to stress about it & be patient but knowing the percentage of success at my age makes it difficult. Any advice, suggestions, success stories?