Thanks for the query.
As you are ovulating regularly and as all tests are noraml, once check for semen analysis
of your husband to rule out the male factor.
Sometimes ovulation induction
can lead to hyper-stimulation.
You have to rule out that and pelvic inflammatory disease
as possible causes for your pain.
If all are normal, you plan unprotected intercourse
around the time of ovulation. This time possibly you will get positive result.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429