Thanks for you replies.

To answer them all, yes I do know I have ovulated. I check my BBT and chart it every morning. And since ovulation I have had consistent high temps. The OPK tests I do one a day between 12pm and 2pm. When I first started using the OPK tests I was doing them twice a day and then I thought it wasn't necessary to as I was getting strong positive results for two days. I guess I need to go back to two a day then. Can I trust my own knowledge? Yes and no. I rely on the OPK tests as I don't have much cervical mucous and never see EWCM (which I am trying to help by taking Robitussin, grapefruit juice, EPO - but still no results). So I can't use that as a reliable ovulation predictor. I can only anticipate ovulation occurring any day from CD14-16.

Could I be estrogen deficient?