Amanda- women who experience miscarriage feel like this, no matter how far along they are in their pregnancy. You're not alone! I've had 2 miscarriages and I'm currently 34 weeks pregnant. The worry never ends; it's a part of motherhood.
My word of advice is to stop worrying about the things out of your control. Enjoy your pregnancy, enjoy the baby movements that you are feeling or are about to start feeling, enjoy setting up the nursery and buying cute clothes. And keep that chin up! Your chances of something bad happening at this point are pretty slim.
Sadly after a mc you never will relax,when you concieve again,ive had 7 loss'es currently 16 weeks pregnant,and still worry.your 23 weeks now,thats a great,yes you worry because of the past,and it wont stop until you have your little one in your arms.there are many of us on here who feel just like you do.there is no cure,well at least I cant find one,just try to relax and enjoy,thats all i can say.