When to tell immediate family?


Will be 5 weeks tomorrow. This is our first baby, it took us just shy of two years to even get this far(super dark lines that are clearly progressing). We had what we believe to be two chemicals last October and then December. Test had faint positive then faded to nothing within days to a week so I can only assume, but never got it confirmed by a doctor. Needless to say we are super nervous and scared but excited, we have talked about waiting until 10-12 weeks to tell both of our parents. Is this too late? How long are you waiting to tell immediate family?