Late for a DMPA Shot?The U.S. 15-Week Rule

Find the date you received your last shot, rather than the date you missed an appointment. The CDC’s¹ injection guidance applies to DMPA, short for depot medroxyprogesterone acetate, given into muscle or under the skin.¹ Confirm the medicine name if your record only says “contraceptive injection.”

The two dates have different jobs

The CDC¹ schedules repeat DMPA injections every 13 weeks. It permits reinjection up to 15 weeks after the last injection without additional contraceptive protection.¹ Keep the usual appointment; the late allowance is there for a missed visit.

At more than 15 weeks, the CDC¹ permits the shot when the clinician is reasonably certain you are not pregnant. Afterward, abstain from sex or use a barrier method, such as condoms, for 7 days. Emergency contraception may also be appropriate.¹

Bring the administration record or ask the clinic to retrieve it. If you cannot establish the date, say so before accepting a new appointment as your only instruction.

A negative test may leave a question unanswered

The CDC’s² pregnancy-assessment guidance uses sexual, contraceptive and pregnancy history alongside any test. If none of its assessment criteria is met, a negative urine test alone cannot establish that someone is not pregnant.²

An early negative cannot exclude pregnancy from recent sex.² DMPA can stop periods, so waiting for bleeding is an unreliable way to decide when to call.¹

When pregnancy remains uncertain, CDC² guidance allows a clinician to consider starting a non-IUD method with a follow-up pregnancy test in 2–4 weeks.² Ask whether that approach fits your circumstances and get a dated testing plan. Do not assume you must wait for a period before receiving care.

Mention recent sex before the shot

If you are overdue and have had sex without a condom, contact a contraceptive service promptly. Give the dates, including any condom break or slip. The CDC’s³ emergency-contraception guidance says emergency pills should be taken as soon as possible within 5 days of unprotected sex; a copper IUD is another option within its placement criteria.³

The injection guidance excludes ulipristal acetate, or UPA, from its immediate late-reinjection emergency-contraception recommendation.¹ The choice matters because the next shot and an emergency pill can affect one another’s timing:

• Levonorgestrel emergency pills: CDC³ allows regular contraception to start immediately, with abstinence or barriers for 7 days.³
• For ulipristal: CDC³ generally advises waiting at least 5 days before starting hormonal contraception. For a provider-administered shot, it permits considering same-day treatment after weighing the risk of reducing UPA’s effectiveness against the risk of delaying contraception.³

Tell the clinician or pharmacist if you already took an emergency pill, including its name and time. Ask them to coordinate the shot, protection afterward and pregnancy-test date. Do not select one medicine solely because it lets you keep an appointment.

Leave the call with four answers

Write down the agreed injection date, whether you need emergency contraception, how long to use condoms or abstain, and when to test. A useful opening is: “My last DMPA injection was on this date. These are the dates I had sex without a condom. What should happen today?”

These are U.S. CDC¹ recommendations for repeat DMPA use; confirm instructions with your service if you receive care elsewhere. The visit-script section in Period, Handled helps turn a short appointment into a plan with a named next step. Put your injection and testing dates beside that plan.