Plss help me doc. i had sex with agirl between january and feb 14 non penetral sex but i still doubt i spilled sperm outside the vagina.now she is not getting period .after sex she become period on february 22nd .on January her date was on 18/1/2018.on February 22/2/2018.on march her date should be on 26th till today she is not period.she become period 4 days later than the last month date. now why is she not getting period. when will be the date of her period