I would wait a month. My doctor told me to wait 3 cycles last time, and it just wasn't necessary in my opinion. This time I'm going to wait a month, until I get my first period after MC, and then hop back on the trying to conceive pony.
It's really up to you.
As for being terrified when you get pregnant again of MC...yep, been there. The stress destroyed any enjoyment of the pregnancy I had but when I MC'd again, I realized the fear of it all was way worse. Now the next pregnancy, I am going to just relax, not tell anyone, and keep my mood stable. Worrying did not change reality for me at all so next time I'm pregnant I'm going to aim not to give into fear. Fear is the mind-killer, a bully, and an illusion.
Your chances are the same for women who haven't MC'd to have a healthy pregnancy as you've only had one loss, according to my doctor. I know MANY women who lost their first, only to go on to have many healthy babies.
The important thing is just not to give up. Stay positive, and keep trying.
I had one healthy pregnancy, and then two miscarriages. I evaluated my diet, had blood tests done, and know where I've been going wrong. I have changed some things, and now I'm optimistic for the future. My advice is just to get healthier then you've ever been in your life, nurture and care for yourself like never before, it will help you in the TTC journey.