Thanks for writing to us.
after unprotected intercourse
can be avoided only if you take a step within 3 days of unprotected intercourse. It is done by using a progesterone
containing tablet called I-PILL, unwanted-72 etc. which have to be taken within 72 hours(3days) of unprotected sex. The earlier it is taken the better the protection and if taken after 3 days, it doesnot ensure protection from getting pregnant.
If you have already missed your periods, i suggest you take up a urine test for pregnancy. Incase its positive, you need to see a gynecologist personally if you desire abortion
Hope i have answered your query.