16 days late

I am 16 days late. No period . Should have gotten it November 21st . Haven’t gotten anything . I only had sex once that month. Have taken multiple tests . All negative . My gynecologist can only see me on January 23 . So all I can do it wait. My boobs are fuller . And I sleep so much . I have lower back pain as if I’m going to get a period but nothing . Has anyone experienced this and still found out they were pregnant even after all the negative tests? Let’s talk girls !