TMI: squeezed my nip.. is this a sign of lactation?

Emily
So I've been worried recently about being able to breastfeed (I had a reduction, had a skilled surgeon who knew my concerns). 
Im 36 weeks now - I've had this weird film on my nipples recently, like I can pick it off and it doesn't hurt but it's so weird..
I've been looking at message boards, someone said to squeeze it, I did and this clear liquid came out.. 
So is this a sign my breasts are getting ready for laceration?
Anyone else had this weird film? I don't think I'm leaking, it just came out when I squeezed. 
*update*: doctor said it was a good sign :)