Our expert says:
The fact that your cycle length is 25-26 days may imply that the progesterone tests are being done too late and therefore reflecting an incorrect result. The best time to do progesterone is 7 days after ovulation and in this case ovulation might be taking place on day 11 or 12 and therefore ideally a progesterone test should be done on day 19 of the cycle. As an alternative you could monitor ovulation by means of urine ovulation testing kits and not only would you be able to predict when ovulation is occurring but also confirm this 7 days later by means of a progesterone blood test.
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