I got a ten gallon tank with 2 Mickey mouse platys for my son's birthday present. I was assured that both the red and yellow MM platys were female. I later found out Red is a girl and Yellow is a boy. I think Red is pregnant but I'm not 100% sure it is possible she is constipated. Red has ballooned out in size. She also seems to take forever to poop and when she does it's a long string. We feed them fish flakes and frozen blood worms. We have had them since May 26th so it is possible she is pregnant but besides her size I can't find another sign of pregnancy. What do you think is she pregnant or constipated?