When to tell your (male)boss

R🌹
So I'm 8w3d. A little background : I work for a kinda small family company. Literally family the owners son is the VP and they hire a lot of relatives of people working there. My sister and nephew work there for example (different departments though)but there are mother & daughters father and sons cousins and so on. Anyway my sister is driving me nuts telling me i need to tell the VP already when i wanted to wait 12 weeks or at least my next appointment which is the 16th of July. She keeps pushing me to tell only because she told them right away but she had already been there abouy 7 years. I've only been there about 3.5 yrs. I just dont feel comfortable telling anyone there yet. The only ppl at work that know are my sister and her big mouth told her coworker bff who also happens to be a cousin of our male cousins wife. And my coworker knows because there is just us two in our side of the bldg and she grew suspicious when i kept going to the restroom. I have yet to tell my manager because he's a big mouth too! I just want to wait til the risk of miscarriage goes down. Am I wrong for wanting to wait? It would break my heart to have to explain to so many people what happened to my baby (which God forbid something does) when I know I wont feel comfortable talking about it.