Took a hpt last night and this morning, both took a very long time to register, however both were negative. Here's the confusing part... I'm 3 days late according to my cycle trackers and glow has never been wrong and the other is usually on point also. My cycles are regular, I've never had an issue being irregular. So.. what do I do next? Wait for my AF ? Retest in a few days? Help. Thoughts? Anyone else experience this?