PLEASE HELP

S.

First month with these opk's usually use the ones with the pink strips. Normally 35 day cycles regular from 34-36 days long. 4 month doing opk's and TTC. Ive always had a normal line progression with opk's nothing like this. I have taken hpt all negative. So unclear when or if I have ovulated yet. The PM of CD 18 or midday on CD 20 are the ones I see positive. I never get a line darker than control always the same as control. Please please give me insight.