Am I having a miscarriage?

The last three days I've felt quite run down and sick.
I've started getting really bad cramps and tightening that hurt so much I'm finding it difficult to stand.
I've been quite wet down there but no blood.
Is this the early stages?
I was unaware I even was pregnant but I'm quite scared and cannot contact any Drs as it's the weekend. 
Sorry if it's too much information.