Opinions please, kinda long.

Okay so I don't know how to word this so it makes sense. I started tracking opks this month. I didn't get a positive till cd23, so when I logged this into glow it pushed my period way back all the way to cd37! Before logging my lh surge glow predicted I was supposed to start it the 19th. Which would make more sense because I always start my period the 16th- 20th and have an average 30 day cycle. So is it possible that I'm still supposed to start my period tomorrow? I'm only 6dpo so I know it would be to early to test but if I'm missing my period that is optimally supposed to start tomorrow (from past loggs) that would be a good indicator that I might be pregnant. I guess I'm stuck with the tww because I don't know if I should trust my instinct or glows predictions of when I'm supposed to start af. Lol. I was very very tired this week, but I ended up just coming down with a cold yesterday. ?