Uncertain & Worried PLEASE HELP

I believe I had my period it lasted three days and I waited a day when I ended to have sex but bf thought I was bleeding it was brown never happened before. The next day I checked and it was still brown and yesterday still brown. I looked it up it could be many things but pregnancy popped up as a possibility. So now I'm stressing bc I seen a post on here a woman took a test after her period and was pregnant. I made a doctors appointment but have to wait for Monday. So please someone help me I looked for a question group and couldn't find one so I'm posting in almost all of them I need an opinion or something