Reasons not to tell our parents that I’m pregnant?

I just found out I’m pregnant this week. I’m not even 4 weeks yet 🫣 This is our second pregnancy, and the first we told our parents around 9 weeks. Is there really any reason to wait to tell them? If something happens, I would be okay if they know our situation. And we see them often, so I’d kind of want them to know I’m tired and feeling sick a lot of the time. Is it a superstition to not tell anyone before 12 weeks?