Positive? Dollar Tree OPK

This is the first month I've tried using OPKs so I figured I'd start out with the dollar tree cheapies. This line is definitely darker than two days ago but is it positive? Last three cycles 28, 30 and 34 days.

UPDATE took another test this AM (CD16.5) and Glow's OPK checker read it as positive. Is it really positive?

CD17.5

CD17:

CD16.5 (12hours after CD16 opk):

CD16:

CD14: