When to test with irregular cycles?

Becky • Mom of 2 💕
My cycles come can be from 28 days apart to almost 35 days. I'm trying not to test before AF in fear of BFN. Should I just test after glow says I am due for AF or just kind of guess on around we it would be. I've been super tired, bloated, slight boob pain, and just achey. But no typical signs of AF.... So any advice will help!