Pregnant Vet Techs/Veterinarians

When did you tell work about your pregnancy? I found out today that I am pregnant! This is my first time and based on things I’m only about 4 weeks. I’d like to wait longer, but with how our job is, I’m not sure I can wait. Especially since I work in a small animal practice that involves masking down patients often. Should I at least wait until my expected period date in a few days just in case? I want to be safe, but I also don’t want to create a false alarm.