Hi and thanks for the query,
the commonest and far most frequent cause of delayed periods is a pregnancy
. However, the symptoms you describe are certainly what is called the premenstrual syndrome
. This simply indicate that you should be having your period very soon. The negativity of the pregnancy test is an indication that you are not pregnant. Irregular menses however could be subject to psychological stress
, However, other pathological conditions could be responsible at some point. It however not rare to have women have some delays in their periods.
I suggest in case this persists you consult an infertility
specialist for a proper evaluation and management.
thanks and best regards,