TMI!!! Four days late, negative hpt, and stretchy cervical mucus. Any ideas?

So I am currently four days late. Af was due Dec 20th and I was supposed to ovulate Dec 5th. Took a test today and it came back negative, however very frequently I have to go to the bathroom because I feel like she has arrived only to find that it's my cervical mucus. There's a lot of it and it is clear and stretchy... My cycles are regular so I am not sure what is going on, any ideas?