I had a similar problem with my first daughter. The important thing is how much she is getting when she nurses.. you can tell by weighing her before and after. There is a place near where I live (Bellingham - Mother Baby Store) that has a scale and a rocker and you can weigh and nurse. It's free. My insurance also paid for one of their nurses to come out and help me.. but in my case we just could not get enough in my daughter, and it was medically confirmed.
I found out later that the breast cups for the pump I was using were the wrong size (although that is unusual...) call the manufacturer and find out how to measure yourself. Fenugreek also did not work for me. By the time I found out about the cup sizes, it was really too late - plus my daughter was not an energetic eater.
Someone mentioned drinking beer - which is really NOT a good idea since it goes right into your breast milk for two hours - but I've heard "brewer's yeast" can help increase milk supply (which is likely what helped the lady who mentioned it).
I ended up having to supplement with formula. I'd nurse her and then give her formula after she'd exhausted my milk. I also continued pumping so my husband could give her as much of my milk as possible while I was at work. Even though I really hadn't wanted to do formula - at least she was still getting the benefits of the breastmilk and we were getting that close snuggle time.
It's a hard thing to deal with emotionally, but things will be okay. *hugs*
With my second, my milk came right in and I was fine - had to nurse her extra often to keep from hurting! So, with your next child, be prepared - but know that things can be different.