When to test?

Ashley
One app says I should start tomorrow (Glow) & my other app (Clue) says I should start on August 7. I had a very light pink spotting on the 27th. LMP was July 9. 22 day cycle isn't a norm for me so I don't know why that's what one app has calculated for me. I've double checked all the data I've put in & they're both the same. Thoughts? Anyone else experienced this?