Yes, you should use a back up method if you stopped taking the shot. Essentially, the protection stops the week you are due in for your shot. Now, the chances of you conceiving are still slim but a condom or even the pill is recommended. Depo Provera is said to stay in your system for up to 18 months but will not prevent you from getting pregnant after you stop taking it, no matter how long it is in your system or how long you were taking the shot.
Antibiotics reduce the effectiveness of birth control. You should use a backup method like condoms.
continue your pill sequence as if no bleeding occured, but it is advised that you use a "backup" method of birth control as condoms for the next 2 weeks
If you're on the progestin only pill ("minipill", such as Micronor, NoreBe, or Cerazette), you should use a backup method of birth control if you're more than three hours late. Us the backup method for the next two days after the late pill (or 14 days if you took ulipristal for emergency contraception). If you're on the combination (regular) birth control pill, you don't need to worry about a backup method unless you're more than 24 hours late.
Incremental
You should use a backup method at least until the next month of pills.
If you miss two weeks of birth control, start your method as soon as you remember. Consider using emergency contraception if you had sex in the last five days. Use a backup method until you've used the birth control correctly for seven days.
Automated System Recovery method
Hello, No you only need to use a back-up method when you miss a pill or are taking Antibiotic medication or other medication which could interfere with birth control. However its always best to play it safe so use a backup method for a few days or until you start the active pills again. Take care
If you miss the first birth control pill in the pack, you are at increased risk for pregnancy. Use a backup method until you've successfully taken seven pills in a row. Consider changing to a different method that will give you better protection.
Use a backup method of birth control for the first seven days of this pack.
You should start the birth control pill on the day the contraceptive implant is removed. If you do so, use a backup method of birth control until you've taken seven pills correctly.
Using a backup method on the birth control patch provides additional protection from pregnancy. Since the patch does not work perfectly, a second method can be helpful. In addition, the patch doesn't prevent infection, so backing up your patch with condoms provides the additional benefit of STD protection.