9 weeks + 3 days and worried about m/c

I don't feel pregnant lately .. All my symptoms have disappeared so I decided to take a pregnancy test and it came up really faint yet when I took one at 5 weeks it was really dark.. I'm worried I may m/c .. I haven't had any cramps or bleeding ... Has anyone else took a pregnancy test at 9 weeks or further and had just a faint as well and if so was everything fine with the baby? My ultrasound isn't until March 2 so have to wait until then to know everything is ok or not ....Really worried