I am 12 days late for my period with negative pregnancy tests. Should I go to the doctor or wait on my period to show up?

pregnancy tests. Should I go to the doctor or wait on my period to show up?" />
I am currently 12 days late. I'm on day 44 of my cycle. My cycles are usually on average 31 days apart.
I had a period March 28 through April 3rd.
Another April 9-12.
A week later I had brown spotting and discharge.
Now I'm late for my period by 12 days. Should I wait it out, or visit a doctor?
I took two pregnancy tests yesterday (Walmart brand) that were both negative. 

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