Utter disbelief!!!

I went for my second beta this morning.  The nurse just called with the results about 30 minutes ago and by the tone of her voice I could tell that I was going to get news that I wasn't expecting and hadn't been preparing myself to hear.  72 hours after my first beta which was 109, my level today was 560!!!!! OMG!!  I still don't know how this could be??  I'm still bleeding somewhat although it has slowed down over the past 24 hours.  Still more than spotting in my unprofessional opinion.  But 560??  That is higher than I have ever been at CD34.  I told the nurse that I was truly shocked because I'm still bleeding and she said some people continue to have what seem to be light periods throughout their pregnancies.  Great, just what a woman who has been TTC for over 3 years and has had 2 miscarriages to show for it needs to hear!  My RE is, of course, out of town this week, but I asked the nurse if one of the other REs was available to talk to me about the bleeding because it is not reassuring despite the strong hcg results today.  Makes me wonder what it could be.  Nothing to worry about??  Vanishing twin syndrome?? Subchorionic hematoma??  I've researched them all with Dr. Google of course.  They want me to wait until next Friday to come in for a third beta and then will schedule a first u/s for the following Thursday or Friday.  The waiting may kill me.  Has anyone else out there experienced anything similar to this?