I have a platy female that has been being chased by the male platy the last few weeks. Now she is in the corner of the tank behind the castle and at the bottom of the tank. She is moving her fins and moves around not very often. This has been going on for 4 days. At first the male Platy was right by her always around and the other fish (4 tetras) were close to her. Now the tetras have left her alone and the male platy is moving around the tank more, but still goes over by her alot. Is she pregnant?