Aww hun! Its totally normal to worry like this - its setting you up for a lifetime of worry. My mum constantly reminds me the worry doesn't end here, it just changes as you get older and your kids grow up.
Even now she worries if she hasn't heard from my brother for 2 or 3 days!!
Try and remember that the only reason miscarriage rates have increased is because pregnancy testing is more sophisticated than it used to be, and women can detect pregnancy much sooner, when perhaps they wouldn't have been able to before, and would have lost their baby before they even knew they were pregnant.
There's still a very high chance that pregnancy will end perfectly normally for you, with a strong healthy baby.
Also, another fact to bear in mind is that with the internet we meet far more many people than we would in real life, and hearing about other ladies sad losses just makes us all worry more, while feeling sad at the same time. Its very easy to think that the same thing can happen to you. Does that make sense? I hope so
But try and take your midwife's advice and enjoy your pregnancy