I'm a new rat owner and I've got two females, Wicket and Pipuri. I've had them for about three days but Wicket who's in heat has been bitting and making squeeking noises when I try to pick her up. She's also been somewhat agressive towards Pipuri. She didn't do this in the store or the first day I had her. I'm wondering if she isn't acting this way because shes in heat. I'm really hoping so! Is there anything I can do to make her relax?