Right now my cycle is about 33 days. When would I ovulate? Glow says I'm in my fertile week right now and I have a 27% chance at getting pregnant today. But I'm not even seeing any positive OPKs yet. This is what I have so far. I just took the last one about 20 mins ago. I'm also reading that you should test in the afternoon and then once at night. Should I change my testing time to the afternoon? Or leave it since I'm still not even getting a positive OPK at night? This is so frustrating, I think starting next month I'm just going use my digital OPKs (just bought mid cycle) and use them from now on like my doctor recommended.