Need advice? 8 weeks in a pregnant starts leaking during a lesson?

It's Becky, Carla's pregnant mom, I've been pregnant for 8 weeks and never experience any trouble with leaking but yesterday I was teaching a cl of 29 yr4 children maths when? you heard splatting hitting the floor I looked down and saw browish discharge leaking from my and its in front of 6yr old children what can i say to make sure their not scared and how do i stop it from happen?