Just take care of yourself and don't think about it. I know it's easier said than done, but it's really that simple. If something bad happens, there's usually nothing you can do about it, anyways, so agonizing is just going to take away your quality of life.
Go to a doctor's to get yourself checked out if you should start bleeding or spotting, because the worst possible problem can be ectopic pregnancy and they can refer you for some tests to rule that out, but that is very rare and not something you need to think or worry about.
If you should bleed heavy and cramp, then go to a hospital. Sometimes, even that isn't a miscarriage, but they are more serious symptoms.
Chances are, though, everything will turn out fine. Think about something other than your pregnancy for a while and *don't* google miscarriage. It's not worth it.