Suzzy,
How often are you pumping? What type of pump are you using? Did you use the protocol (birth control pills)? If so, how long? One thing that I found that really helped me increase from just drops is compression. While I was pumping I would use my thumbs to massage the breasts and push the breast tissue into the flange. That is how I first got sprays while pumping. After pumping I would also hand compress and get some milk out. I got sprays from hand compression before I did while pumping. Consistency is key.... keep to a schedule of pumping and you will see progress. Keep up the good work!