Does having a "bluish" cervix almost always mean you're pregnant?

I was told today by my dr that I have a bluish cervix. I have like all the symptoms for being pregnant, and I have been before, so I know what it feels like. I’m 3 weeks late. I’ve had 4 neg preg test, 1 urine. 2 home test, and 1 blood test. Plus I’m so so so dizzy and have extreme back pain, nausea, sometime breast tenderness, so so so tired, and sometimes pain like there are cysts. So, I want to know has anyone had a “bluish” cervix and not been pregnant?