HELP FROM EXPERIENCED BBT CHARTING

Mandi • I`m 28 & married to the love of my life. Currently pregnant w/ my 🌈👶🏻. Angel baby 10/16/16 👼🏻 WE ARE HAVING A BOY! 1/1/18 💙
This is my 1st cycle charting, and my 1st cycle since my MC in October. I got positive OPK but my temp has been the same for 3 days after...I'm confused by my chart and need help understanding why my temp hasn't gone higher. I take my temp every morning at 4:30 or 5:00am, even on weekends. My tests were dark and now they are light so what's going on?