Bleeding

I'm 9wks 6days and when I got to the bathroom I have dark reddish/brown blood. It looks old. I had this with my first baby too at 11 weeks. It took us so long to get pregnant again though so I'm worried. I feel fine...no cramps. My back hurts a little but only after being on my feet all day. I have an appointment Tues. Should I wait and see if it gets worse and make it to my dr appt. or call tomorrow?