CD13 and still no positive OPK Please Help 😞

So glow says I’m gonna ovulate in two days, my periods are always on time like it says. Surely I should be getting a darker test line by now? It’s barely visible 😞😞 I feel like it’s not gonna happen to me ttc for 3 months now which I know isn’t a long time for some people but I just feel like i should be seeing something on the OPKs already. Has anyone else had blazing negatives to just have a blazing positive straight after? I’m testing twice a day, midday and 6pm. Not drinking and withholding urine for 4 hours so its not diluted. Please tell me I’m not broken 😫