Not sure if it a period or no period?

Was suppose to start period yesterday. Started to have the feelings I was and kinda spotted off an on all day. Then at night my SO and I had sex and I placed a plug in for the night and not much blood just liquid. Now have no blood at all on plug, but no symptoms of pg so not sure what too make of it. Grrrrrr. Am I going crazy, need help if this normal or abnormal.