First trimester, my symptoms were on and off..ive also experienced previous miscarriages and it can be worrisome but try not to over think it...most of my pregnancy now has been without symptoms and my baby girl is doing fantastic! Enjoy your pregnancy and try not to worry! You got this! Blessings your way!
Usually symptoms wear off as the placenta takes over. My symptoms left around that time as well
Nausea is common in the first time and is not usually a sign of miscarriage. You could also have the start of a stomach bug, nothing to worry about, just stay hydrated. Toast with light butter always helped with my nausea