Waiting to see a peak

Mama3

4th months of tracking... still am not getting a peak. Last 3 months cycles were 27, 27, and 14 days long. I'm assuming I'm not ovulating but could there be another reason why I can't get a line as dark as the control. Current test is on the bottom at CD 17. The 3 before that are CD 16. The 14 day cycle test lines were hardly visible.