To test or not to test?

Let me preface this post by saying I have PCOS and have irregular cycles.

I bled for three days May 19-21st, which I assumed to be a period. Took a digital and got a BFN.

Fast forward and Glow says that this week is my fertile window, and ovulation is Thursday. I’ve been spotting light brown discharge yesterday and today. Very light. Not even enough to justify a pad or tampon. I also have had horrible heartburn and fatigue. I took another digital four days ago and it was negative. Should I just go by a first response?