question: Hello Doctor... Actually i m preety worried these days.. . I had sex with my girlfriend one month ago .. but its 37 days now till the stoppage of her last menstrual cycle and till now she havent got periods... i also gave an i pill withing 12 hours .. How long should i wait now ... also i remember tht to prevent pregnancy ... i didnt secrete any sperms inside her and still gave an i pill bt its 37 days now and she havent got her periods... how long should i wait ...