Spotting and brown discharge.

Sigh... Im 6 weeks 5 days. On the 5th and 6th of this month I experienced very light pink/red/brown spotting for 2 days with no cramping. It was never heavy enough for a pad and only showed up occasionally when I wiped. A week later I had light brown discharge only once when I wiped. None of those happened after sex. Two days ago my husband and I had very gentle intercourse, yesterday I started having light, brown spotting. This morning I get up and its worse and I'm also cramping. My first appointment is on Tuesday. I'm just so paranoid that I'm miscarrying. Should I go ahead and call my doctor or just wait until Tuesday? Could this be happening because we had sex? Has anyone else experienced this?