Bbt chart/ovulation day

This is my second full cycle of temping and both charts look way different. Around cd17 (this cycle) I had a positive opk (test darker than control) then a couple days later I had intense cramping so bad I was laying in the floor in and out of consciousness. Those cramps lasted for like 3 days and tapered off to none or an occasional little pain. Today is cycle day 30 and my period is due on the 16th/17th and I had a negative pregnancy test yesterday so I feel like I’m out. I guess my main point is, what day was ovulation and were those cramps normal (I know they weren’t normal for me personally) and what am I doing wrong? We’ve been trying for 9/10 now months with no success.

First is this cycles chart then last cycles chart.