Hello there...I can understand your concern. It would have been better if you had given a little more details like how many days was the sexual intercourse and when was her last menstrual cycle bleeding. If it is more than 3 days since the last sexual intercourse, then wait till she gets her next menstrual bleeding. If she misses her next cycle, then ask her to take a urine
pregnancy test and consult a gynaecologist for further evaluation. If the intercourse was within the last three days, then consult a gynaecologist as soon as possible. Based on menstrual cycle history the gynecologist will advice her further.