When should I go to the doctors?

artsy_dragon
My periods have not been very consistent over the past few years. I went back on the pill a few months ago and so far they have been consistent and lasting a few days.

However I am now 8 days late and I have taken 2 pregnancy tests which are both negative. I've been under a lot of stress recently so maybe that why it is delayed but this isn't helping me!

Should I call the doctors? When should I do this? Should I wait a few more days and try to get a more expensive test like Clear Blu? I've used cheap pregnancy ones off Amaaon and they have been decent but I just want to be 110% sure!
When should I go to the doctors?
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