Anxiety...need advice! 😩

I'm 8 weeks and a first time mom. My husband and I are thrilled, but I can't help feeling doomed. We got pregnant on our first try and I see so many women here who've tried for so long and it makes me feel gulity....like we got TOO lucky. Now I'm worried about the chance of misscarriage because I see so many posts about it. Or what if my baby has health problems down the road? I know this is all out of my control and worrying won't change anything, but I can't stop! 😩 I'm worried sick! We've told the VIPs in the family that we're expecting, and we want to tell everyone else now since I just had my first ultrasound and saw the heartbeat, I feel like if we tell them, then we'll jinx it. Any reassurance would be helpful.