Producing milk already

Amanda
Hi everyone. I am on my second (hopeful) pregnancy. We took a test on Wednesday and had a faint positive but we are rechecking tomorrow just to be sure. My question is, I am already producing milk, and I feel really full like I did when I breast-fed my first. It is really uncomfortable. Would it be okay to start pumping to relieve some of the pressure? Would that make me start leaking? Would it make me produce milk instead of colostrum once the baby is born? Any advice/insights would be appreciated.