I had to register just because of this thread.
I had a hetertopic pregnancy in 2005. I did not get pregnant through IVF. We were on Clomid, though.
The pregnancy had a strange start. When I had my blood test to determine if I had ovulated, I had, but the level was very low, so we thought that pregnancy was not attainable that cycle. Then, I missed my period. When the OB sent me for blood work, my beta levels were very low. So we repeated them. They were still low but they were climbing, so we assumed that all was well.
I had continual spotting throughout the first 12 weeks and even visited the ER one weekend due to lots of spotting. The lab at the ER told me my beta level was non-existant and that I was miscarrying. They sent me home and then called the next day that they were wrong and all was well and the number was considerably higher than the last that I had received.
When we talked to the OB, he said that the numbers appeared that I might be carrying twins, but ultrasound only showed one heartbeat in the uterus.
At 12 weeks exactly, the ectopic pregnany ruptured and I had emergency surgery with over a liter of blood taken from my abdomen. All was well after that and my little guy just turned two last month (He's crackers).
Not sure how that is all relevant, but I just had to thow it out there.