No ovulation

Ali

My husband and I have been seriously TTC (we had a more relaxed approach months prior to this) for about 4m now and this month I don't seem to have ovulated. I was due to ovulate 3 days ago but the strips now seem to be getting lighter and lighter yet at no point were they dark enough to indicate ovulation. Is is possible that my urine wasn't concentrated enough or is this normal? I'm very confused. TIA for any help x