Bbt reading need help...chart included

I got a postive clear blue opk on the 13th, the 14th my temp dropped, 15th it climbed but it wasnt my highest temp in my cycle, now this morning it has dropped again 😫. I did have to take my temp an hour early this morning at 430am instead of the usual 530am. Could an hour really make that much of a difference? (The open circles are times when I had to temp an hour earlier). All my ovulation symptoms disappeared yesterday, cm is creamy now, opk is negative, and cervix is closed and firm now. what do you think is going on? Had a D&c; in may. This is the first cycle after, took 6 weeks to get my first AF and my hch just dropped below 5 last week.