After Ulipristal: When to Restart Hormonal Contraception

You took an emergency contraceptive pill and now need to know when to take your usual hormonal contraception. Check the emergency pill’s name on the packet or pharmacy record before following a restart instruction.

The US ella label also specifies the five-day wait and barrier contraception until the next menstrual period. Ask the pharmacist to write the restart date and backup instructions for your own prescription.²

Why restarting too soon matters

Ulipristal has antiprogestin activity. Starting a progestin-containing contraceptive close to the emergency dose can interfere with ulipristal’s action. The five-day instruction is about that interaction, rather than waiting for bleeding to begin.¹

If your next step involves a clinic appointment for an injection, implant or hormonal IUD, tell the team you took ulipristal before the appointment. CDC¹ allows clinicians to consider immediate initiation for these methods after weighing competing risks. That requires a clinical decision, not a self-directed exception to the waiting period.¹

What a 33-participant study measured

In a prospective study at Oregon Health & Science University, 33 participants completed cycles with ulipristal alone and with a combined pill started two days after ulipristal. The pill contained 150 micrograms of levonorgestrel and 30 micrograms of ethinylestradiol. Researchers used ultrasound and blood testing to follow ovarian activity.³

Follicle rupture in less than five days occurred in 1 of 33 participants with ulipristal alone, compared with 9 of 33 when the pill was started two days later. Two of those nine ruptures occurred before the combined pill dose.³

These were ovarian measurements, not pregnancy outcomes. Nine of 33 does not mean a 27% pregnancy chance. The study enrolled healthy people aged 18–35 with regular cycles and a BMI no higher than 28, and tested one combined-pill formulation. It cannot supply your personal risk or a restart rule for every contraceptive.³

Get the backup instruction in writing too

The restart date and the end of backup contraception are separate questions. CDC¹ advises abstaining from sex or using a barrier for seven days after starting or resuming regular contraception, or until the next menstrual period, whichever comes first.¹

The ella prescribing information instead directs barrier use until the next menstrual period. It warns that fertility can return rapidly after treatment. Do not assume the emergency dose protects sex afterward.²

Those backup instructions differ. Show the pharmacist your ella instructions and usual contraceptive packet, and ask which written plan applies. Keep using the prescribed barrier protection while clarifying; do not shorten it based on a calendar calculation from this article.

The play

Try this: ask for three written details

1. Record the emergency pill’s name and the date and time you took it.
2. Bring your usual contraceptive’s name and the dates of missed doses. The ella label directs suspected hormonal contraceptive failures to that product’s prescribing instructions.²
3. Ask: “When do I restart, how long do I use backup, and when should I test for pregnancy?”

For bleeding changes and testing, see our three checks after an emergency pill.

Use dates when the question feels awkward

Period, Handled, Chapter 3’s “What to Say When It Feels Like TMI” section models specific descriptions of what happened and when. Use that approach for your medication question: exact names, dates and a written answer. See the book.