Period 8 days late. BFN yesterday.. opinions?

My period is now 8 days late and I had a BFN yesterday morning.

My CM is for the most part clear with milky looking consistency sometimes (not all the time). I do have symptoms such as sore boobs (it’s super noticeable without me trying to symptom spot) and my watery cm is going into my underwear. Stomach feels tight too.

Should I keep testing? Should I take the BFN and accept it as simply a missed period? What would you do??