My sunburst platy is pregnant?

my sunburst platy is pregnant and i cant catch him to put him in the breeding net,there is other fish like guppys,other sunburst platy and a nother i dont know its name but i do now is kind of a fin biter.i have a litte decoration that no fish or any thing go in and its spaces are to small for any of the fish to goin and there are two plants i think are good for hiding,a couple others are pregnant or just big