Opinions?!?

Ok, so my period is now 16 days late, I have taken multiple tests and they all keep saying negative, at what point should I go in and have a blood test done? With my first it took a while to get a positive as well. But my periods have been regular for the past 6 years. I’m not stressed anymore than normal, I have days where I am nauseous on and off all day and then days where I am fine. And I also have had ridiculous amounts of cm, one day it’s mucous-y and other days it’s watery, and I get ridiculously bloated every couple days but other than that I haven’t shown any other symptoms of pregnancy. What do you guys think?!

Here’s a picture of my calendar from my period in October and the times BD until now if that makes a difference ! I don’t know if I’m just overthinking or what but this isn’t really normal for me