hi babyface - and welcome to BB (and the horrid tww)

it's hard to say what symptoms you might notice (everyone is very different). the things most common that i've noticed from other threads are:
sore bb's
AF type pain - but no AF
queasiness
feeling bloated

some people who've had positive results have mentioned a small bleed when their embie has implanted (which would have been a few days ago for you if it happened)

are you going to do a home test before your blood test (or have you done one already?)