Leaking milk at 21 weeks

I started leaking milk a few days ago and for the last couple of days I’ve been leaking throughout the night. I sleep braless but now that I’m leaking I will have to invest in some maternity bras, and nursing pads to avoid leakage my question is, is this a normal amount to leak? is this a lot? That’s only from one breast, I’m leaking about the same amount throughout the night from both. I’m not sure what’s normal I’m a FTM