Help Please !!

Glow has always been spot on with my periods I mean I have never been a day late using glow, it has come early before like 3 days but that only happened once. I’ve started using OPKs and now that I have started tracking my ovulating glow is pushing my ovulation date and period date way back. I’m not sure what to think at this point 😫🤦🏾‍♀️ December 3rd was my original ovulation day and I feel as if I ovulate that day but glow says other wise. I only got a almost dark line on cycle day 12 all the others have been very faint. At this point I’m frustrated because I’m not sure when to test for pregnancy or when I may have ovulated 🙄 has anyone else had this happen ? Any advice ?