Hello, Welcome to the Boards and Congratulations on your Pregnancy..
Speaking from experience and have had a few m/c when I was younger I know how every little ache and pain can cause concern.. AF symptoms in early pg are VERY normal.. If there is one thing I know about is the difference between a m/c and being pg... a m/c always... comes with blood.. there might be a few rare cases out there but for the majority.. the blood comes first..
So take a deep breath relax.. I am high risk pg until my 20th week.. and I am only 12 it is your time to relax focus on making your body and baby healthy..
Good Luck to you and Blessings for a Happy Healthy 9 months..