According to some, there is a kabbalistic concern about coming into contact with tumah (ritual impurity) immediately after immersion. However, the first person/creature you encounter on emerging from the mikveh is the mikveh attendant. Therefore, you don’t have to be concerned about passing cats or other animals on your way home, and you don’t have to be concerned about it affecting your pregnancy.
Please feel free to get back to us with any further questions.