Are my fish pregnant?

It is possible to have either problem. What kind of fish are they? Are they live bearers or egg layers? Live bearers will show a dark gravid spot around their vent/anus. When they are ready to give birth they look almost square around the belly.

Bloat is another issue, bloat is caused from over feeding, it is another way of saying that your fish is extreme;y constipated. The remedy suggested for that is a few frozen peas that you squeeze the meat of the pea out of and into the water for them to eat.