Current medical status: Very light, short period then more light bleeding two weeks later. Been sexual inactive since early June and had normal periods since until this one though cycles have been getting further apart (30 days, 36 days, 38 days).
Current medical treatment: Been taking naproxen sodium for migranes which occur sometime around my period and usually last 3-5 days. But can easily be triggered by stress.

It is hard to say what causes your cycle irregularity but pregnancy is a very unlikely possibility. Pregnancy can cause a missing period but not irregularity. Cycle prolongation (without other symptoms) could be due to a hormonal misbalance in the axis hypothalamus-pituitary-ovaries.

You could consult a gynecologist about your problem.