My cat just had kittens they are 3 weeks old yesterday.. Tonight they were out walking with mom and she started making what I can only describe as fart noise mom ran over she started having runny stool but when mom was cleaning her up I noticed what looked like blood not in her stool but like she was pushing so hard her rectum bled? I took mom and kittens to the vet last week and they said they were all doing good .. Any ideas what it could be??? Is she ok?