Mom15, the same thing happened to me. My symptoms disappeared around 6 weeks, but I didn't miscarry until 10 weeks. Ugh, having to wait until 9 weeks for reassurance is horrible! With any luck, I might be able to find the heartbeat with my doppler before then (I've located baby at 8 weeks in past pregnancies) but if I can't find it, I know it will totally freak me out.