TMI***** brown discharge

Ladies I’m not sure how any of this works. But I just found out I am pregnant about a week and a half ago. But judging by my last cycle I’m already 10 weeks! However last time I thought I was further than I actually was. I don’t know how I missed that but I did. I had a miscarriage last year with twins. I have yet to have a pregnancy stick, even though no sign of anything preventing me. Yesterday I noticed a brown discharge. I have been told this is old blood. And I have nothing to worry about but I am still concerned. Any advice?

** I am not able to see my doctor until the 22nd. So I am kind of freaking out while trying to remain calm. I tried to contact the advice nurse on call today but I got no answer or call back.