My cat Boo is pregnant again unfortunatly,(I had an appointment to have her spayed but didn't realize how soon after having her first litter she would be in heat again.) Her first litter, two females now 3 months are still with us. (we are now looking for good homes for them) Boo, who was a wonderful first time mom and a loving and affectionate cat now growls and hisses at us and is very aggressive to her older litter. She attacks them whenever she sees them. She has also tried to bite me when I tried to pet her. Is this a normal reaction for a pregnant cat? she didn't do this with her first pregnancy.. and will she return to normal after having this new litter?