Is the 'something' telling us we should have another baby?

Okay - you're going to think i'm crazy, and I think I am too... and for that matter, my husband for SURE will! To make things brief, my husband was scheduled to go to a vasectomy appt about a year ago, and for some reason, it didn't happen. And then he was supposed to go today for a consultation at the urologist, but through miscommunications between doctors he never actually had an appt. Is it possible the 'universe' is trying to tell us something? We already have 3 beautiful healthy kids, and we've said we're done. But i've always held out that 4 is an even number. I just don't know. I think at the end of the day, if its meant to be, it'll happen. Crazy through? Quite possibly!