A virus that infects bacteria is known as a bacteriophage, often shortened to phage. The study of viruses is known as virology, and those who study viruses are known as virologists. It has been argued extensively whether viruses are living organisms.
2 doctors agreed: 7 days: Most doctors recommend 7 days of birth control pills before having unprotected intercourse. Even with pills, there is still a 4-6% chance of pregnancy over course of a year. If miss 1 pill, take that pill immediately the next day with that days pill. If miss 2 days pills, take 3 pills and use back up method until you get your period.
If you are not likely to remember to take a pill each day, you probably should consider a longer-acting form of birth control, such as the injection, patch, implant, vaginal ring or IUD. Roughly 85% of women who do not use birth control and are trying to get pregnant will conceive within one year.