I'm 24 weeks tomorrow with a baby girl on the way I'm a ftm and its fine for that to happen. It happened to me once on my left breast and never did it again. So yes it is normal.
Congratulations! It's colostrum and yes it's very normal for you to leak that before the baby is born. Mine haven't started leaking yet but when they do it's good to wear nursing pads cause my nipples always stuck to my clothes and being they're so tender it hurt to peel off.