Chart experts!!

Jenna

Judging by just my bbt chart can anyone give me the best idea of when I ovulated??? Had to start progesterone but was supposed to start 4 dpo. I put a positive opk on CD 16 but I had a positive strip on CD 15, 16 and maybe even 17 but NEVER got a positive on a digital. I'm new to bbt charting but usually get a + opk on 15, 16 or 17. Just worried because never got a digital and not too savvy with bbt yet!! Lmk if you can hel