To test or not to test?

So I'm on day 37 of my cycle...mine are never really regular and have lasted anywhere from 24-35 days but never longer than 35.  My last 4 cycles have been 24-28 days.  I took a test on day 31 which was bfn...I want to test but I just don't feel any symptoms other than creamy discharge and light on and off nausea (but we all know how that can be in our head) and I really don't want to see another bfn...what do you think should I test today or wait?