I think fantasies of how an alternative life would have panned out are common. I imagine some people who didn't have children perhaps think from time to time of the rosy cheeked perfectly behaved tots they would have had.
In general though I think it's natural to look back on your younger years with nostalgia and I would have liked longer to just enjoy being a newlywed to DH but it wasn't to be.
No, I don't regret them and I would have them again.