I am 20 years old boy and I had unprotected sex with my gf before 20 days and she does not took any pills or anything to stop unwanted pregnancy. And now her periods have been late to 15-20 days. And still not having periods. She is 18 yrs old. And now she is too much scared of getting pregnant. What are the symptoms to know whether she is pregnant and what should we do to stop getting pregnant. Please help mee. Yours faithfully.