I wish I had some positive news, unfortunately I'm just chiming in because I'm in a similar situation.
Tested positive for pregnancy on the 8th of feb, started bleeding and cramping the next day- but i was on birth control and in between packages, so its when my period should have come anyway. But I went into the ER just in case- they took a blood test my hcg came back as 154- ultrasound showed nothing because it was so early (i say 3 weeks, they said 5, but i know date of conception). They sent me home and said to come back every three days. Went back on feb 12th hcg was 256- still going up but not doubling. This is when they told me to expect the bleeding and cramps to get worse. However- the next day bleeding stopped, and cramps were very very mild. hardly there at all. Went in again yesterday- hcg is at 364 still not doubling. At this point they advised it's not a normal pregnancy and I should expect more bleeding and cramps- i started spotting brown, and mild cramps that have been there always.. I have to go in for an ultrasound in the next few days to see if it's tubal. Hopefully they find something! Not knowing is driving me crazy! Let me know what has happened with yours, Good or bad *hugs*