Late period

So I'm 16 days late did pregnancy test on day 2 late which was negative (although other half says he could see a vvvvvvvvvvfl) but on 14th day late had watery brown discharge only when wiping Ive been googling til it's drove me insane there all saying could be implantation or early pregnancy anyone everything had this or can shed some light on this please cycles are usually very regular 28 day cycle 5 day bleed