when to announce?

Im 25 years old pregnant with my first 6wk3d and im just wondering at what point do people announce to their family? I already did. It would be way to hard to hide and frankly I just needed emotional support. but after reading somethings on this app it seems everyone waits until 2nd trimester. Im just wanting to know if anyone else has told their family and how early? Am I crazy? also I had to inform my college directors because Im in school for radiology and they have to know asap to keep me away from radiation and get me a fetal radiation monitor. Thanks in advance.