References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Had a one-night stand and worried about the sexual health implications? You’re not alone, and there are practical steps you can take. Depending on when and what happened, options include emergency contraception, PEP for HIV, STI testing at the right time, and self-care. Here’s a calm, non-judgmental guide to looking after yourself.
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Within 72 Hours
This is the emergency window for two key interventions:
Emergency contraception (if pregnancy is possible)
- Morning-after pill (levonorgestrel or ulipristal) — from pharmacy or sexual health clinic
- Copper IUD — more effective, up to 5 days after sex, fitted at a clinic or GP
PEP for HIV (if exposure was possibly high-risk)
- 28-day course of antiretroviral medication
- Must start within 72 hours — the sooner the better
- Available at sexual health clinics and A&E
- Free on the NHS
Within the First Week
| Action | Why |
|---|---|
| Consider PrEP for the future | If you’re likely to have more unprotected sex, PrEP provides ongoing protection |
| Watch for symptoms | Discharge, pain, unusual symptoms should prompt same-week assessment |
| Take care of yourself emotionally | One-night stands can bring mixed feelings — that’s normal |
At 2 Weeks
You can now test for chlamydia, gonorrhoea and trichomoniasis. Options:
- Home test kit (free from NHS services)
- Sexual health clinic
- GP surgery
At 4-6 Weeks
Test for HIV (4th-generation lab test) and syphilis. Most sexual health services offer these alongside chlamydia and gonorrhoea.
At 3 Months
Consider a final confirmatory test for HIV, hepatitis B and hepatitis C if those are relevant to your situation. For most people, this is the final reassurance point.
What to Test For
A comprehensive screen after a new sexual contact usually includes:
- HIV
- Syphilis
- Chlamydia and gonorrhoea (urine or swab)
- Hepatitis B (and hepatitis C if indicated)
- Throat and rectal swabs if relevant
Emotional Side
One-night stands can bring up different feelings — regret, relief, excitement, confusion. All are valid. Sexual health staff are non-judgmental and deal with these situations routinely. If you’re feeling anxious:
- Talk to a friend you trust
- Contact a sexual health clinic for advice
- Remember that many people have had similar experiences
- Getting tested often helps with anxiety by giving you certainty
Consent Matters
If you’re unsure whether what happened was fully consensual, or if you were drunk or drugged, you don’t have to process this alone. SARCs (Sexual Assault Referral Centres) can help with or without police involvement. The Havens in London and similar services across the UK offer confidential support.
Read more: PrEP and PEP | When to test | Home STI tests
Frequently Asked Questions
Should I always get PEP after a one-night stand?
Not necessarily. PEP is for high-risk exposures. A sexual health clinician can help you assess your specific situation.
How worried should I be about HIV?
If both partners are low-risk and protection was used, the risk is very low. Higher-risk scenarios warrant prompt advice and testing.
Is it OK to feel guilty afterwards?
Feelings vary. There’s no right or wrong way to feel. Focus on the practical steps to look after your health — that’s within your control.
Related reading
- Can You Get Chlamydia From Kissing?
- Can You Get Herpes From Kissing?
- How to Talk to Your Partner About STIs
- How to Tell Your Partner About an STI
- Blood Test for Syphilis, Hepatitis B and Hepatitis C
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
