It very well can be a manifestation of PCOS but the things don't stop there, it can be an Ectopic Pregnancy, Appendicitis
, a torsion of Ovarian cyst
, a Mittlesmerz, Diverticulitis
and a myriad of possibilities to go on....
Put a stop to this-
Have a Ultrasound
of whole abdoman, a preg test-UPT, CBC, RFT and Urinr Routine and culture and review to some experianced clinician