Me and my gf had unprotected sex one month before. Though I did not ejaculate into her but for extra safety she used 'Option 72' one pill on the next morning. Since then she is feeling constant stomach pain which sometimes become unbearable. Last night she has severe back pain too. Though she had her periods on time but the period duration was 4 days only which used to be for 5 days previously. In pregnancy test done one week before it showed negative. Can you suggest me some remedies for pain ?