sorry tmi in advance, I was sitting on my bed binge watching Being Human (US) and all of a sudden my…

sorry tmi in advance,

I was sitting on my bed binge watching Being Human (US) and all of a sudden my side started to hurt a little.

then i felt like a bubble at the verge of my vag opening, i then put my hand down there and there was like a watery but kinda milky liquid coming out of my vag.

I got up to use the bathroom and boom I felt it run down my leg. It had a very mild smell I can't explain exactly what it smells like though

Should I be worried?

Has this happened to anyone, and if so what happened next?

I'm really worried about going into preterm labor....