Imo, I'd call. I'm a worrywart and call at the first sign of anything! call them and if they say its normal, thats fine, just bring it up at the classes. They're run by midwives anyway and they'd give a 2nd opinion.

I leak cm but i guess thats normal. it kinda smells like a cross between semen and vinegar (how odd!) I wear a liner... but it seems that it manages to miss the liner and still end up on my knickers... how embarrasing!