@tiantian1005 hey, welcome and congrats. I'm in a similar boat, a CP at 4+3 and MMC at 8wks since Nov last year, now 5+1. I'm generally quite an anxious person, but I've been ok so far. There's nothing I can do that will change the outcome, so I just feel like I'm along for the ride, and what will be will be.
Having had a MMC after no spotting, some nausea, etc, and knowing people who have both had abnormal bleeding and had healthy pregnancies and had horrible nausea and still MC'd just makes me feel like symptom spotting is meaningless.
What everyone says is that you have to stay in the moment - right now you're pregnant, and that's good, and the odds are on your side - datayze.com/miscarriage-reassurer
You could try some mindfulness/calming activities?
There's also another thread for due Apr/May after MC, if you just want to vent all your anxiety to people who understand. :)