My baby constantly wants to eat!

She is 6.5 weeks now and I feel like I'm confined to the couch with her attached to my boob 24/7! She will feed for 30 min and then I will try to put her down and she starts to cry and shows signs that she's hungry. She can be a little bit lazy on the breast, but I don't know if it's because she's not getting any milk out at times or if she's just not that hungry. Lately she has hardly gone more than an hour and a half between feedings during the day. Is this normal?? Could I not be producing enough milk to satisfy her? I would really like to pump in between feedings so I can stock up for when I go back to work. But with her feeding like this, that's impossible. Any advice is greatly appreciated!