HELP OVULATION? ??

Ok so this is my first time using these strips for tracking my ovulation. The bottom is yesterday morning CD 16 I started cramping on CD 15 and some on CD16 Yesterday. So I assumed I Ovulated between these two days but I think the line should be darker but last night and this morning they are looking like the ones on the top. So what are the chances I Ovulated even if it's not that dark or am I still in? Ugh this is so frustrating. . Baby dust to all