4 days late, BFN a day ago

Hi All! I am now 4 days late for my period...I took an at home test the day before yesterday and got a negative. I have no signs of AF yet though. I have been feeling nauseous the past two days non stop, and been tired/emotional. But these can be symptoms of ovarian cysts (which I know I have two of) or PMS.  Has anyone one else experienced this? I want to test again but don't want to do it too soon, If that's possible.