Question about ovulation

So this month was my first time doing OPKs and my line progression was weird. I have a 33 day cycle and on CD14 my window started as per glow and so I started testing and it was faint up until yesterday on CD 17. The line was dark yesterday so I assumed I ovulated then. Today I tested for the fun of it to see if it would be darker than yesterday, well it was faint like before. So my question is, did I ovulate for sure yesterday? Is it normal for it to go back to being faint like before? I don’t quite understand how these work but I followed the directions and read them within the correct time frame.