watery cm

So I'm due today/tmw and today at work I went to the toilet thinking I'd come on as was rather wet. TMI but when I pulled my pants down cm literally dripped out and onto the floor! Saturday and Sunday I have had period pain tummy aches and lower back pain and thought I was coming on (this pain usually happens 10mins before I start) I have headaches, my boobs almost stopped hurting Friday but now feel very heavy tender and nipples are very itchy, just done a test but it was BFN. On the days I had the cramping I popped a tampax in to check for any blood and there was a  small pin prick amount mixed in with some cm and I told DH it's over for this month. Still no period???