A sexual education counselor might be able to give you some ideas about how to bring up the subject with your parents.
FYI without contraception 85 in 100 young women will get pregnant this year.
If neither you nor your relationship is troubled by your problem, taking no action may be the most appropriate course at this time.
After 24 hours, nitrates may be administered if close monitoring is provided and proper facilities are available for fluid and vasopressor support.