We have been trying now for over a year and nothing has happened. I have very regular periods and when I do ovulation tests they come back positive, but my progesterone blood tests are always less than zero. Could it be that ovulation tests can work and you still don't ovulate even with a regular cycle?
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I presume when you write “progesterone less than zero” you mean the values are in the low, non-ovulatory range. I would recommend progesterone blood tests 7, 9, and 11 days after ovulation sign. In case of abnormal findings I would suggest that you have monitored ovulation induction treatment (usually Clomid). It is also important to check your partners semen quality before considering fertility treatment.