BBT Confused about O day

[Holliems]

Can someone please make sense of this for me? It's my first month temping and when I started I thought I knew how to read charts but wouldn't you know, mine isn't so easy to read. To me, anyway.

I THOUGHT I had Oed on CD 15. Thats what FF told me the second time it changed my O day. When I put in my +OPKs and changed FFs way of reading (to include opks) it changed it to CD17. Now, with that being said, lastmonth, (not charting. Only going off OPKs, FF said I Oed on CD17) Anyway, a different chart is also saying I Oed on CD17 going off temps.

What does it look like to you? IF I DID O on CD 17, then it looks like I COULD have gotten an "implantation dip" at 9 DPO. Just so happens that on that day of dip I started cramping like AF. Lastnight the cramps were pretty painful. Barely there today. AF isnt due until Wednesday. Days away, still.
https://i666.photobucket.com/albums/vv30/holliemshr/51A43548-4DD6-4CF9-BCDA-66ADBD38984B.png_zpszcg8smbc.jpeg~original
Opinions? Im super confused...kinda hopeful or atleast trying to be.

 

[rose.]

I think you ovulated on CD 15/16 and the drop below cover line could well be an implantation dip. Wait a couple more days and test again

 

[Holliems]

I think you ovulated on CD 15/16 and the drop below cover line could well be an implantation dip. Wait a couple more days and test again

Thanks Rose. Gonna get DH to pick up some cheapies from the store today. I guess if its neg this month, there's always next month to try again!