How soon should I reveal I'm pregnant?

Emili

So my husband of 6 years and I are apparently pregnant with our first baby. I'm not sure how far along I am, I have a doctor appt. today and I'm 95% positive I'm pregnant. Once it's confirmed, how long should I wait to tell our families and friends? I saw online, some people wait until the second trimester. Is it because there is a higher risk of miscarriage in the 1st T? I am completely new to everything involving pregnancy. We were not planning, but also haven't been 'careful' lately. I'm trying to get excited, I feel like telling others will aid that feeling.