Oh the joys of pregnancy! Not all women find it that 'glowing' time. And, yes, depression can worsen during pregnancy do to an onslaught of hormones. If you find your depression gets worse, talk to your doctor about it. Depression during pregnancy is very, very common.
That said, you are 8 weeks pregnant so still have 32 left to go, there is plenty of time to be over the moon! Right now it might not seem very real. A few things are going to change that - hearing the heartbeat and having an ultrasound. But even then if you feel distant from the pregnancy that is ok too. Everyone's feelings are different.
Whatever you feel is whatever you feel. Maternal instinct will kick in after the baby gets here. ;)