hey just a quick question. one of my girls left a spot of blood where they were sitting yesterday on the edge of the bathtub. I checked the litter pan and no blood there and checked them physically and saw nothing unusual, except a scratch boo put on my nose for the trouble, but could this mean they are in heat even though they are so young? And how do i know which one if they are? Callie is about 5 months old and to the best of our knowledge Boo is about 4 months old. And i am positive about Cupid because she is fixed already.