Relief and paranoia

A

I went to my 10 week appointment today. I was extremely nervous because at my last 10 week appointment I found out I had a miscarriage. So, my nerves were high. The doctor did an u/s. He found a growing baby and a good heartbeat. What a relief! I have my 12 week scan on the 10th. I'm debating whether to announce my pregnancy now or after my scan. I told a neighbor but she asked if I was (I said my 5-year old was going to be a good big sister) and I couldn't lie. I haven't told my kids either. They were devastated when I lost my other pregnancies and now I'm super nervous I will receive bad news at my 12 week. Am I being too paranoid?