By the sounds of it mate, shes only been in flower about 5 weeks... I have no experience with blue dream but at a minimum you will need to leave her 8 weeks, 10-12 isnt uncommon. If I were you Id look at some other information out there on when to harvest. You didnt screw up mate, Ive trippled or quadroupled my yields since my first grow... its not just one factor, its a whole host of things which ive picked up from trauling through forums basically. If you leave a plant vegging for that amount of time, you want to make sure you train your plants to maintain large, dense buds whereas if you allow them to get tall and scrawny you will end up with popcorn buds, keep feeding her for the time being, dont over do it though, twice a week should be fine. your buds should enlarge and become more mature over the next few weeks so dont harvest just yet.
When you do harvest, hang them in a cool, dry place with lots of air flow... your first homegrown smoke is always the most satisfying. enjoy.