Normal?

This is my 3rd month off bc, my second month off my period was a week late (according to glow app)it came after cycle day 37. This month I’m almost 2 weeks late according to glow app and today would be cycle day 40 is it normal to go this many cycle days without starting? I took a hpt two days ago and it said negative. I’m getting a little frustrated because it’s getting hard for me to really see when I’m ovulating or not and I would like to TTC but this is making it hard. Any suggestions