Clear blue advanced fertility monitor vs ovulation sticks?!

Im confused!
​I got two peak days on my advanced clear blue fertility monitor on Wednesday/Thursday (2 days of high before that!). Also used my internet cheapie sticks but I got a negative those two days but a positive Friday & Saturday! Which is accurate?!? It gets me wondering because if I had just gone by one test I may have missed some vital days by being too early or late! ? Any one experienced this?!