hi, i have three female cats who arent spayed (they dont go outside) and recently the nipples on two of them have gotten bigger and hard, and their tummies have gotten a little bigger. they had worms though and im not sure if thats the culprit? we had one male who was trying to mount his sisters (different babies) but hes only about half the girls' size, so its improbable that hes been able to mount them. are their nipples like this because they went into heat or because theyre pregnant?? there havent even been any signs that theyve been mounted and we dont have any unaltered males.