New here and TTC for our first

Hi all! 1st time posting and new to the whole TTC. So hubby & I are TTC. Been tracking on glow. And this time around I used clearblue advanced digital ovulation tests. On glow was supposed to be O last week but test showed no LH surge until Sunday and it's been high all week but no peak. I'm 36 so maybe issues are starting? I'm just getting confusing messages from glow predictions and the O test. Any help would be appreciated. Thanks ladies.