Ob-Gyn questions? Ask a gynecologist online.
in this case you can exclude pregnancy for sure becuse the result of blood test is 100% reliable. Ther reason for your problem can be a hormonal imbalance, the use of monk´s pepper (Vitex agnus-castus, over the counter at pharmacy) could resolve it.
Dr. N. Scheufele
if there are still open questions, I will be glad to answer them.Otherwise please don´t forget to honour my work with a kindly rating.
Thanks a lot, all the best for you,