It's your pregnancy, it's up to you. I found I was pregnant at 5 weeks and told my husband and my mom the day I found out but we waited until about 8 weeks to tell everyone else. Tell people whenever you feel like it. As ProudMumToBe said a lot of people do wait until they're about 12 weeks but I think it's just a superstitious thing.
I told my family at 12 weeks. There's a history of miscarriage in my family (I don't know if it's genetic or not but it's a lot. My mom had 2 miscarriages, my grams had 6, 2 of my aunts each had 4 and 1 aunt had 3.) and I didn't want to tell them and have something happen. Luckily nothing did and everyone was super excited.
It's up to you. At my 1st visit that we saw the h/b (6w) my RE said that although the h/b was strong, based on my age (I am 38), there was a 40+% chance of m/c at least one twin. We saw the h/b a couple more times and me and my DH felt more secure so we told the families at X-mas (I was 9.5 weeks). I was already beginning to show and everyone figured out I was pg anyway - the twins were a huge surprise, though. If you feel confident and are comfortable sharing the news, then go for it.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.