OPK confusion help!

Juli
Cycle day 14 - positive digital and faint line on cheap test stick 
Cycle day 15- cheap test stick lighter then day before 
Cycle day 16- positive cheap test stick 
This is our first month ttc so I continued testing because I don't fully trust the opks yet. 
Has this happened to anyone? Which one should I trust? Could this mean I have pcos

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