trying not to worry

Just recently found out I was expecting again.  This will be my second birth and third pregnancy. Found out I was pregnant Christmas eve 2016 and went for my first ultrasound Jan 20th and found out that I was having a miscarriage. Though my body showed no symptoms of the miscarriage the baby and not continued to develop passed 3 weeks. I am worried this time around as it has only been a few months. I don't want to go through that heartbreak. We were so excited last time we told everyone this time we are waiting until at least 10-12 weeks along. Any suggestions on how to calm my fears? How many of you have gone on to have healthy pregnancies following a miscarriage?