Holding onto Hope

My future hubby got a vasectomy in a previous marriage. He had his sperm counted and he had a zero sperm count and so there is a less than 1% chance we can get pregnant without having a reversal. I still hold onto hope every month that somehow one of those little soldiers made it, but my FH just gets upset that I won't 'look at the facts.' I just hope we can afford this reversal soon, so every time I start having symptoms, there's actually a possibility.