You're in the middle of an alien invasion where said aliens wield ray guns that impregnate the victim, with longer exposure resulting in more babies. If you are caught, you'll be taken away by the aliens to become an incubator on a spacecraft. In other words, game over. You'll have to survive until nightfall, as the aliens need sunlight to function at all. The babies you could be carrying only grow and develop when your belly is exposed to sunlight, so you could possibly stay pregnant forever.