Late time of year...Painful intercourse? Help!?

My girlfriend has not have her period for over a month and a partly. Two recent pregnancy tests proved denial, and a recent visit to her doctor yield the result that her light drinking habis may be causing irregular period. This was a moment ago from a diagnosis of her eating customs, NOT any examination of her vagina. Then, closing time we had sex, it hurt deeply for her when she got on top, and she be doubled up with cramp-like distress for hours. We have be having sex for months, and this is the first time it's happen. Is this a disease? Any websites on it, I couldn't find any. We're both very concerned and want to minimalize full-grown contact as we are only 16.
Answers:

What are signs of ovaran cyst..?

I strongly suggest you read some of these sites, it will grant you an idea what might be wrong next to your girl friend. I do think she requirements to see a gynecologist but its always best to come arranged with question and answers, i.e. the Doctor might ask a few question nearly how, when, what etc. I would not chose to go stern to a doctor who does not examine me and give some irrelevant reply to a problem next to your friend's period. I do hope the problem will be solved and lots of moral luck.

Should I just throw it away?

she should see a gyno they own more idea more or less that stuff it sounds serious. good luck hope everything is fine