What was the first day of your last period? Do that date until you get an ultrasound. The test isn't saying how many weeks you are its guessing how many weeks since ovulation
for me it became real when i first heard the heartbeat and of course with ultrasounds. Although even so its still unreal probably until the baby comes!!
My OB didn't want to do an ultrasound on me until 11 weeks, because she didn't want me to waste money on seeing something I could barely see, but it's not too early to go to the doctor :)