Your best option is to wait until you harvest.
If you smoke it and get really high, it's probably the amnesia.
If you smoke it and don't really get high, it's more likely to be the CBD Blueberry. (Although you could get a Blueberry dominatie pheno, in which case my theory does not work.
)
Rub the stem, do you smell any strawberry or blueberry notes?
Truthfully, there is no sure fire way to know 100%. But use the above and some experience should help you make an educated guess. I find it's much easier to tell strains apart in bud form.