reveling the news

So I'm not going to let my family know about being prego tell after the first trimester, but when I do I'm really scared. Please don't judge but I just got out of rehab and live in transitional living with my 3 year old. I have done through a lot in the last 6 months and I'm just scared hey are going to be really disipointed and not happy. I know it's not their s*** I just don't know how to tell them when I'm ready.. HELP!