Opk no surge????

Toni • Hey everyone. I'm 25 had my first daughter in March 2017. Not trying to get pregnant again :)
Hey girls! 
So bought a opk kit from Walmart. It said to start testing on day 19 (I have a 35 day cycle ish) I started testing on day 14 and have not gotten a line as dark as the control line, in fact the one I took today (day 19) was light almost non-existent. The first few I took in the afternoon but today I took it with FMU. The box says it works anytime of day. 
Do you think I missed it or just keep testing? 

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