Not sure how to track my cycles

Hi! So I went off the pill at the beginning of March. My first cycle without the pill was 34 days. Then last month it took forever and was 53 days long. Now, I am on my 3rd cycle off the pill and officially TTC. According to glow my fertile window is this week, but that's based on a 31 day cycle. My plan is to BD every other day, at least, for this month but I don't know when I should consider myself late of when I should take a test! Any suggestions? Thank you in advance!!