How To Avoid Pregnancy After Unprotected Sex?

Hello, I had unprotected sex on 20th feb. First time after my last period which was on the 11th of Jan. I generally have a 40 day cycle of menstruation. So accordingly my periods was due on the 21st of feb which has still not come. I fear being pregnant. As per the calculations it's 9 days. Can u please suggest any home remedies or medicines to avoid getting pregnang incase I am?