Oh My MIL

Gabriella
We are over the moon that we are finally pregnant after trying for 3 years. We have only told our parents. As in my parents and all four of his. Well his mom keeps texting him asking if she can tell the family or if we are going to tell the family anytime soon. I'm only six weeks as of today, how can I tell her we are going to wait to say anything till after the first trimester. She hasn't really said anything to me only to my husband which is ok I guess but I've only meet his whole family 3 time and even then no one talked to me so why should I say anything? 
What should I do????