Female mollys can store sperm for several months (up to a year i think) and produce young every couple of months from the stored sperm.
No immaculate birth im afraid, not the messiah, just a very naughty boy. Expect more fry. And if you arent careful with seperating male from female in your young, expect even more fry.
To be sure of not getting fry, male only is the way to go.