Hello there...I can understand your concern. you have sexual intercourse 20 days after your menstrual bleeding and took am ipill after that. so the chances of getting pregnant very minimal. since you have taken ipill you might get some irregular bleeding in the next few days. don't worry about that. it is normal. however if you miss your next menstrual cycle, then do a urine pregnancy test and consult a gynaecologist for further evaluation.