Ectopic and HCG levels

Marissa
Those of you who have had an ectopic pregnancy....what were your hcg levels?
My hcg levels doubled the 2nd draw but did not double the 3rd draw but did go up. On the 4th draw, it wet up again but did not double. On the 5th draw it went down by almost double. Then in the 6th draw, it went down more than double. But then yesterday, it went up a little. It was at 87 a week ago and yesterday it was 114. The doctor now seems concerned because she was expecting it to continue to go down. She ordered me to have my blood drawn again and an ultrasound today. I get the results tomorrow morning. My highest HCG level was 452 and I had an ultrasound done at 6 weeks and the doctor saw nothing in the ultrasound. Does anyone have any input at all? I'm so confused and scared. :(