It could be the implaintaion. U can have syptomes as early as a week after u get pergnate but the implaintion process takes two weeks. So I think u should wait a week after u stop than take a test. U could be pregnate. But u can syk urself out into believing u are and ur body will show the symptoms, so u should go to a docture if the test comes out negative anyways.
Always
~dezii