Version July 2025
| Women whose menstrual cycles are usually between 26 and 32 days | |
| Date of last period known | Start immediately |
| Date of last period unknown | Start on first day of next period |
| Special circumstances | |
| Postpartum/breastfeeding | Wait for at least 4 periods |
| Start after two most recent periods are about a month apart | |
| Three-month DMPA injection used for contraception | Wait for at least 90 days after last injection |
| Start after two most recent periods are about a month apart | |
| Pill, patch, implant, emergency contraception, intrauterine contraception, miscarriage or abortion | Cycles before using method or pregnancy were 26 to 32 days long |
| Start on first day of next period | |
