lots of cm period 2 days late

So I've been cramping for the last 2/3 days so I just thought my period was starting. However they are on and off. I also have a lot of cm it's watery but kind of creamy coloured, it's so much that it's actually soaking my underwear. I've been incredibly moody and my moods have been all over the place. The only symptoms I'm getting are sore nipples and I feel slightly sicky and uncomfortable. I'm really unsure of what is happening