leaking boobs???

Monique
One night after being sexual I was laying down catching my breath. Laying on my side so I was kinda squished one of my boobs but they were both leaking a bit. I told my husband and he said yea I touched them last night while we were sleeping and they were wet too.
I'm only 17 weeks along.. (4month)
my first pregnancy I didn't leak at all threw the whole pregnancy!!
I swore also while at work one leaked and felt kinda wet but not enough to go threw a shirt! 
Has anyone else had this happen?
How far were you along?
I didn't think it can happen this early!!