Glow predicted ovulation day vs OPK test strips


So I’m new to this whole ttc thing. Have been working on it for 2 months now and learning more and more each day. I was originally just going by my glow calendar and when it told me I was going to ovulate. I just decided to buy some opk test strips off amazon thinking that maybe glow isn’t as accurate as I originally thought. Opinions/experience on this? fingers crossed for month 3!!!!