Spotting brown, one small bleed, nothing since..

Roughly 6 weeks along now, still haven't had my first appointment. Had blood drawn last week and found out Monday they said "3-4 weeks along" but I was 2 weeks late when they tested so by my calculations it'd be 4-5 weeks when they drew blood. But of course it has had me wondering if my hormone levels are lower than they should be and could cause complications..

I had pretty consistent brown rusty spotting last week and early this week. Then Thursday morning I woke up to find a good bit of blood, no tissue. And some very light and brown spotting until my lunch break at 11 yesterday. But since then, nothing. No blood, no spotting, just nothing. I'm kind of panicked that that was it, that it could be over. Anyone else been through this or have any words of wisdom for a first-timer?