I have a 6 week old kitten who is still nursing from her mother and I started weaning her too. I noticed today that she can't poop I checked her anus and there is a little bit of poop in there but she is playing and eating wet food just like the usual behavior of a kitten.There is no poop in the litter box and she is trying hard to poop but there is still a really little bit of poop when I check her anus after she tried to poop. Is this a serious problem? What should I do first before I bring her to vet