5 days late with a negative test

Soo this app says that I’m 5 days late I took 2 pregnancy tests 1 yesterday and 1 today and both negative. When I look at the Flow app it says my period shouldn’t come till today and still nothing...

Am I stressing too much and should I wait to test again or keep testing daily or go see the doctor...

Now history... last November I got my IUD out because it was expired my fiancé at the time said we would be careful and just let my body go it’s course so get myself regular. Now I haven’t really paid attention to my period until now

What should I do?