Early Ovulation?

This is my first month using Glow as well as my first month using OPKs. I have another app that I was using mostly just to track my cycles but we recently went from not trying, not preventing to TTC. The other app has been accurate on when my cycles will start for the most part, occasionally it varies by a day one way or the other. Well I got a positive opk Sunday and when I entered that into the glow app it moved my expected period up by 4 days. Should I go off of what the other app has predicted since I have been using it for so long or should I follow the glow app now? I have always thought I ovulated a little earlier than the other app says but until this month haven't really tracked it to closely. Is my cycle just off this month or do I have a longer period of time between ovulation and my period than most? Sorry I'm obviously new at this so any insight is appreciated! 😊