Ovarian pain, irregular period

Hello everyone, I read a lot of the posts on this site and everyone seems really helpful, so I thought I'd try posting here as a last resort. My girlfriend has been going through quite a rough patch for the past 4 months. One night her and I were just fooling around ( no sex ), I was just playing with her, she was on her period, it was light. At the end of it, her period completely stopped.
After few days she started complaining about pain in her ovaries, her period started coming every other week regularly, like after every week. This started in September and happened till December and now she hasn't gotten her period in about a month and a half.
She went and got a pap smear done and everything came fine there.
She's really freaking out.
I have tried looking extensively online but someone's saying something, other person is saying something else.
I just need some pointers as to what it could be ? any thoughts ?
i don't expect a full diagnosis and understand it could be multitude of things, but just need some direction so that I could relay this information to her and explain to her ....

[Bhupinder Kaur, MD]

Hello,
Aside from pregnancy, a delay in the menstrual period could be due to physical or emotional stress, depression, malnutrition, sudden weight loss or gain, certain drugs, medical conditions (such as polycystic ovarian syndrome, thyroid or adrenal gland problems), breastfeeding, or others. If there is even a slight possibility of her being pregnant, she may do a home pregnancy test (HPT) one week after her missed period. For proper evaluation and management, I suggest she consult a doctor (OB gynecologist). Blood tests, pregnancy test (serum bHCG - more sensitive than HPT), vaginal smear, ultrasound may be done. Treatment will depend on the cause

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.