hi patsy....glad you have confidence in us and have come out of lurkdom
here's the thing...for IVF's i believe you can get a ++ beta a little earlier than on a natural cycle...BUT...you are right. you can have implantation right up thru 12 dpo.
with regards to drowning your sorrows (which i hope you don't have to do) mother nature has a way of protecting the embryo to an extreme in the first 6 weeks of pg. i think it was intended this way b/c so often women (who aren't OCD like many of us here...LOL) don't even realize they're pg for a while.
my sister had a polyp removed from her cervix (i think they actually burned it off somehow) and she was pg (very early, only a couple of weeks) and they didn't know it. my sister had nitemares thru her whole pg that her baby was born with the top of his head singed off. needless to say she was very concerned that she had this procedure done while she was pg...but her baby was born perfectly healthy and his head was fine...LOL
ok, sorry to get off on such a tangent. the alternative, if you are very concerned is to push your b/w up to 10 dpo and 12dpo. although this is still on a fine line b/c if implantation does occur late, there's a possibility you could stilll get a false result at 12 dpo. i know i'm pobably adding to your dilemma...sorry.
i'll keep my fingers crossed that you get a +++ and don't have to worry about drowning your sorrows