The fish in the forefront of pic two looks she may be preggers because the bottom looks squared off. Can you post some face-on pictures. When my gups are about to pop, they look like rectangles with fins.
If they're pooping a lot, then they're not constipated, which is good. If they've ever been around boy gups, then they're pretty much guarnateed pregnant. It's just a matter of how far along.
If you don't have room for the babies, then just let them stay in the tank when momma gup gives birth. The other fishies will eat the babies; it's natural and good for the adult fishies.
Similar Aquarium Fish Forum Threads 
