Confused about BBT

This is my first month charting my bbt. I haven’t used opk’s. I haven’t had perfect timing each time when taking my temp but I’m doing the best I can. We are TTC but I haven’t conceived so I only starting charting because I’m afraid I’m not even ovulating and I feel that may be the case because my temp hasn’t gone up yet. Even though glow says today is O day all my other apps say it was 2 days ago which seems more realistic because Glow is trying to say I’m about to have a 30 day cycle which I haven’t had in a long time. My periods are slightly irregular but I don’t think I’m about to have a 30 day cycle. It feels inaccurate and I’m afraid my temp just isn’t going to go up. 😩