Breast milk

23 weeks and I think I'm starting to get milk. There's been a small clear/white discharge from my nipples for a couple weeks. What would happen if I tried pumping? Would it mess up my supply once the baby is here? Like would it make things out of balance by starting to pump this early? Or could it help me produce more ? Anybody pumped while pregnant? I'm not saying I'd get an enormous supply build up or anything I'm just curious on what would happen if I did try to pump now