Miscarriage — What Happens, What Your Options Are, and Where to Get Support — Evidence Library

What it is

Miscarriage — pregnancy loss before 20 weeks — happens in about 10–20% of known pregnancies (and more when very early losses are counted). It is almost never caused by anything you did. Most first-trimester losses are chromosomal and would not have been prevented by any change in behavior. Once a loss is confirmed by ultrasound or bleeding pattern, you generally have three management options: expectant (wait for the body to pass tissue on its own), medical (misoprostol, sometimes with mifepristone, to help the body complete the process), or procedural (a suction D&C/MVA in the office or OR). All three are safe and evidence-based; the right choice is the one that fits your body, your timeline, and what feels least traumatic to you.

Evidence review links

Each link opens the full review on the publisher's site in a new tab.

Possible benefits

Knowing the three options up front reduces the sense of powerlessness in a moment when very little feels in your controlReview sources ↓
Timely follow-up (hCG trend, ultrasound, or pathology) confirms the process is complete and rules out rare complications like retained tissue or ectopic pregnancyReview sources ↓
Grief support — from a partner, therapist, or peer group — helps early and does not require 'being ready'Review sources ↓

Possible risks

About 1–2% of early losses have complications (infection, retained tissue, heavy bleeding) — the 'when to call' list below covers the specific thresholdsReview sources ↓
Ectopic and molar pregnancy can present like miscarriage and need different treatment — ultrasound early mattersReview sources ↓
Rh-negative parents typically need Rho(D) immune globulin (RhoGAM) within 72 hours to protect future pregnanciesReview sources ↓

Alternatives

Expectant management: wait up to 2–4 weeks for the body to complete the process on its ownReview sources ↓
Medical management: misoprostol (with or without mifepristone) — completes the process at home over hours to a couple of daysReview sources ↓
Procedural management: suction curettage / manual vacuum aspiration — completed in minutes, tissue can be sent for chromosomal testingReview sources ↓
For any option: ask about pain management, what to expect visually, and who to call after hoursReview sources ↓

Usually normal — and when to call

Common examples that surprise or worry many people. Each pairs a plain-language "usually normal" note with concrete signs that deserve a call to your care team. If something feels wrong that isn't listed here, call anyway.

What is normal? →

Heavy bleeding
Within the range of normal
Bleeding during a miscarriage is heavier than a period and often includes clots. Cramping comes in waves as the tissue passes.
Call your healthcare team if
You soak two full pads in an hour for two hours in a row, pass clots bigger than a lemon, feel dizzy or faint, or your heart is racing — same day, in person.
Severe or one-sided pelvic pain
Within the range of normal
Cramping in the middle/low pelvis is expected. It usually eases significantly within a day of the tissue passing.
Call your healthcare team if
Severe one-sided pain, shoulder-tip pain, or pain with fainting — go in. This can signal ectopic pregnancy, which is a surgical emergency.
Fever or foul-smelling discharge
Within the range of normal
A brief low-grade warmth in the day or two after passing tissue is common.
Call your healthcare team if
Temperature ≥100.4°F (38°C), chills, foul-smelling discharge, or worsening pelvic pain after things had improved — same day. Retained tissue and infection are treatable when caught.
Emotional wellbeing
Within the range of normal
Grief can look like sadness, anger, guilt, numbness, or intrusive thoughts — often in waves for weeks or months. There's no 'right' timeline.
Call your healthcare team if
You can't sleep, eat, or function; you feel disconnected from reality; you have thoughts of harming yourself — call your provider, PSI (1-800-944-4773), or 988 (US crisis line) same day.
Trying again
Within the range of normal
Most people can safely try again after one normal cycle, though there's no medical reason you must wait — physical and emotional readiness are separate questions.
Call your healthcare team if
You want to talk through timing, or you've had two or more losses — ask for a recurrent-loss workup so you're not repeating decisions without more information.

Educational reassurance only — never a substitute for your care team's advice. When in doubt, call.

Current evidence

ACOG Practice Bulletin 200 (Early Pregnancy Loss) is the primary US guideline. The addition of mifepristone to misoprostol raises medical-management success rates from ~70% to ~90% and is now recommended when available. NICE (UK) NG126 covers the same three options. Share Pregnancy & Infant Loss Support and PSI's loss directory provide free peer support. Grief timelines vary widely and there is no 'right' amount of time.

Where the evidence is clear · where people may choose differently

For most topics, guidelines from ACOG, WHO, and other major bodies broadly agree on the core safety points (when to act in an emergency, informed-consent standards, monitoring baselines). Where reasonable people — and even guidelines — differ tends to be around thresholds (when to start or stop something), preferences (comfort, environment, support), and values (how you weigh small risks against benefits). Use the questions below to explore those pieces with your care team.

Educational only. Your care team can help you weigh what applies to your specific situation.

Heavy bleeding

Severe or one-sided pelvic pain

Fever or foul-smelling discharge

Emotional wellbeing

Trying again