Maybe so. Can't see exactly. But if this fish has been around a male fish either at the store or in your tank, it is 99%-100% chance.
The area in front of the fish's vent (poop exit) will become larger and darker. The fish will look a bit square/fat.
The fish in the tank will eat tiny babies as in nature. If you can add special mats in the top of the tank and or live plants to help them hide.