It could be a false pregnancy. Has she had any morning sickness? Usually morning sickness comes about 3-4 weeks after they get pregnant if it's going to happen at all. It's too soon to tell if she is pregnant for sure but maybe it would be a good time to have her spayed since you want to anyway. Take her to the Vet and tell him your concerns.
PS. I LOVE the name Crickett. I might steal that name for one of my puppies. It's so cute!!
