Yup as i was told when buyiong livebearers 99% of the time they are already preggers.
I personally dont make to much effort. I have males and females. When they have fry i leave nature to do its thing. When they feel safe/are bigger they come out of hiding and join the other fish.
Have never bothered with a breeding trap. In my eyes if they get eaten, it just wasnt meant to be.
Good luck with the fry tho as its very exciting! Watiching them grow is sooo cool.