How bad is it that I haven't told my family yet?

Brittany
I'm 9w6d and I haven't told anyone but my BF. My BMI is almost 50, my Dr says I have Hypertension, and I'm not very active. My biggest fear is getting my hopes up and something happens to our little miracle baby... Especially after reading numerous post about miscarriage. Has anyone else felt like this? How long have/did you wait to tell your family/friends?