I found early on I was not getting a productive latch for my baby. When she gets a latch where there is some of the areola as well as the nipple it helped a lot more. She was able to get more milk when she nursed. I also found my baby starts to pop on and off the breast when she has to burp or when she is done.
I would agree with others, your baby may also be on a growth spurt as well. This is her way of telling your body to produce more milk.
It gets better. I am at 9 weeks, and initially I thought I had low milk supply. I was supplementing with formula after trying to breastfeed and she was still fussy. Now, I can exclusively breastfeed, or supplement with formula if I am out visiting. I just am sure to pump when I get back to continue to keep up my milk supply.
Good luck! Hugs!