Using OPK's Changes Cycle?

Bonnie
I've got a question. This is my first cycle using OPK's and it showed me ovulating earlier than the normal 14 days. When I put it in glow it changed my cycle and showed I'd start my period sooner and put me at a 25 day cycle but I know this won't be true. AF usually always comes 27 - 30 CD. So will glow correct this later when it learns my cycle that I ovulate early but still have my period the same 28 day or so?