Your abdomen feels like a basketball.
You're doing the math.
Is this normal, or is this the thing they told you was under 2 percent.
A 1-2 percent severe rate and a one in three forum estimate aren't necessarily contradicting each other.
Nobody explains that part, so people pick whichever number scares or reassures them more.
This is what the numbers are actually measuring, symptom by symptom, so you can tell which one applies to you tonight.
Why the percentage you were quoted won't help you tonight
ASRM's figure for severe OHSS sits around 1-2 percent.
Forum estimates run as high as one in three.
Both numbers can be accurate and still measure different things.
One is severe cases per cycle.
The other includes mild and moderate symptoms, self-reported, across whole donor populations.
That gap explains the argument between clinics and forums.
It does nothing for you at 11pm with your stomach on fire.
You don't need a debate about denominators right now.
You need to know what your body is telling you.
What the denominator actually hides
HFEA's data suggests about a third of donors get some degree of mild OHSS.
ASRM's 1-2 percent is specifically severe cases, counted per cycle.
Put those next to each other and the "clinics are lying" story gets more complicated.
Mild bloating is common.
Severe, dangerous OHSS is not.
Nobody hands you a way to tell, in the moment, which one you're having.
That's the actual gap in the counseling you got.
Here's how you close it yourself.
The breathing test that matters more than any stat
Fluid from OHSS doesn't stay in your abdomen.
It can move into the space around your lungs.
One donor described it as feeling "bubbles around my collarbone."
Another had chest pain and pleural effusion serious enough to need the ER the day after retrieval.
Pulmonary edema from OHSS gets treated as a medical emergency, not a nurse-line question.
If breathing feels harder lying down than sitting up, that's your signal.
If it's getting worse over hours, not staying the same, go now.
This one doesn't wait for a callback.
How fast weight is coming on, and why the speed matters
Some donors report gaining five to ten pounds or more within days.
That's not the number that matters.
It's the speed.
Fluid retention from OHSS moves fast because fluid shifts out of your blood vessels into your abdomen.
Slow, steady bloating over a week reads differently than five pounds in 48 hours.
The faster the gain, the less this looks like normal recovery.
Rapid weight change is a data point your clinic can act on immediately.
Say the number and the timeframe when you call.
Press on your stomach and see what happens
Multiple donors describe their abdomen reaching "the size of a basketball."
One described her stomach as looking "five months pregnant," painful to the touch.
In at least one case, an exam found swollen ovaries literally touching each other.
Ovaries in severe OHSS have been described as swelling to the size of grapefruits.
A soft, distended stomach you can still push on is different from one that's tight, tender, and won't give.
Rigidity plus pain on touch is not a wait-and-see symptom.
That combination calls for a same-day, in-person exam, not a phone script.
How much you're actually urinating
Difficulty urinating shows up again and again in severe accounts.
It matters because your kidneys are downstream of everything else going on.
Fluid is leaving your blood vessels and pooling where it shouldn't.
Less urine output means your kidneys are getting less blood flow to work with.
If you've had little to no urine output in six to eight hours, that's not a hydration problem you fix with a glass of water.
That's the exact opposite of the advice you were probably given.
If you're worried the ER will send you home and call it nothing, ask them to check this number specifically.
The pain that stays put versus the pain that spreads
Cramping and mild nausea for a day or two fits inside normal recovery.
Vomiting for eight days straight does not.
One donor described exactly that timeline before getting real relief.
If you can't keep fluids down for more than a day, you're at risk of dehydration on top of OHSS.
That combination escalates fast.
Pain that's stable and dull is one thing.
Pain that's spreading, sharpening, or keeping you from moving is a different situation entirely.
What a second cycle changes about your risk
A smooth first cycle doesn't guarantee a smooth second one.
A first cycle going well isn't proof your body "handles it well."
It might just mean the dose was lower.
Some donors have their medication dose increased between cycles with little explanation.
One case involved a clinic attributing a severe reaction to the donor being "super fertile," rather than addressing the dose itself.
If your second cycle involves a higher dose, ask directly why, and what changed in the protocol.
"Your body handled it well last time" is not an answer.
It's a guess dressed up as reassurance.
What to say when you call, so they get it
Nurses have described sounding unsurprised on the phone about OHSS symptoms, despite calling it rare in counseling.
That tells you something.
They've seen this before, even when the intake packet said they hadn't.
When you call, give the specific numbers: eggs retrieved, weight gained, hours since last urination, breathing changes.
Some donors didn't learn their retrieval count, 43, 53, even 63 eggs, until symptoms had already escalated.
Don't wait for that number to be volunteered.
Ask for it, and connect it out loud to what you're feeling now.
If the ER says it's nothing
A small interview-based survey found 15 donors reporting moderate to severe OHSS, in a sample where most had never been formally told they had it.
Under-recognition is common, even inside medical settings.
Going in and getting a clear scan is not the same as being wrong.
It's how a mild case gets ruled out, or a severe one gets caught early.
Either outcome beats guessing from your couch.
If they send you home, that's information too, not proof you overreacted.
Who pays, and why that question can't stop you
Cost worry is real, and it's reasonable.
A stroke ten days into hospitalization, or an ICU stay after 53 eggs retrieved, costs far more than an early ER visit would have.
Ask your agency in writing, before your next cycle, exactly what's covered if OHSS requires hospitalization.
Get the answer on paper, not verbally.
Then treat your symptoms based on your body, not on what you're afraid the bill might say.
What it looks like when you got it right
Some donors have called themselves "extremely lucky" to survive two life-threatening cycles.
Luck isn't a plan.
Knowing your own thresholds is.
Breathing that's getting worse, weight climbing fast, a stomach that's rigid instead of soft, urine output that's stopped: these aren't vague warning signs anymore.
They're a checklist.
You don't need the forum number or the clinical number to use it.
You just need to notice which one you're looking at, and move.