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I’ve I many IVF cycles and have never had a posititve turn to a negative, HCG isn’t present unless your pregnant. I would be excited but I always felt cautious too, as when you have had difficulty getting pregnant it seems to good to be true. I took a HPT when I was expecting my boys six days before I was scheduled for the official blood test and got a strong postive (it changed really quickly) b/c my hcg was higher b/c it was twins. Lots of luck!!
Yes! It is only possible to havea positive if the embryos implanted and the trophoblast started secreting HCG. Congrats!
Congrats! I hope your blood test goes well 
Thank you so much for responding!!
I’m unbelievably happy but as wildrose said you get a bit cautious with these things.
Lets pray it keeps growing along 