Bbt chart question

Mandy • 💏2012 🎀👶🏼1/10/14👼🏻+👼🏻+👼🏻+👼🏻2019👼🏻6/30/19,👼🏻5/31/20

When will the cover line come onto my chart? I’m on the day after ovulation now I just thought it would be on there by now? I’m having problems with my bbt and every one is saying as long as it’s not under your cover line your good and I have no clue what they mean I don’t see one on mine