Pumping to increase supply

Breanne • Baby girl due March 24th, 2016! 💕
Idk what I'm doing wrong but pumping is not increasing my supply. I'm pumping every 3 hours besides at night (baby has a 5-6 hour sleep). At this point baby is getting more formula than breastmilk I'm afraid I'm not going to be able to get my supply up. How long did it take for your supply to increase from pumping? Any tricks or tips? I'd like to increase it in 24 hours. I've been taking fenugreek with no luck.