Okay, let's tackle this question. The user is asking about the chance of recurrence of a first-trimester spontaneous loss. The patient had one miscarriage and is worried about another.

First, I need to recall the core concept here. Recurrent pregnancy loss is typically defined as two or more consecutive losses. The first loss is usually not considered a significant risk factor for recurrence. The main point is that after one miscarriage, the risk of another isn't that high.

The correct answer is likely option B, which probably states that the chance is around 15-20%. I remember that after one first-trimester loss, the recurrence risk is about 15-20%, whereas after two losses, it's around 25%, and after three, it's about 30-40%. So the initial risk is lower.

Now, the distractors. Options A might be a very low percentage like 5%, which is incorrect because the risk is higher than that. Option C could be 30%, which is more relevant after two losses. Option D might be 50%, which is too high and doesn't align with the data.

The clinical pearl here is that a single first-trimester loss doesn't significantly increase the risk of recurrence. It's important to reassure the patient that the chance isn't as high as they might fear. The key is that recurrence risk increases with each subsequent loss, so after one, it's still manageable. The high-yield fact is the 15-20% range for recurrence after one loss.

**Core Concept**
The risk of recurrent first-trimester spontaneous abortion (miscarriage) after one prior loss is relatively low. Recurrent pregnancy loss (RPL) is defined as **three or more consecutive miscarriages**, and a single prior loss does not significantly elevate recurrence risk.

**Why the Correct Answer is Right**
After **one first-trimester spontaneous loss**, the recurrence risk is approximately **15–20%**. This is due to the majority of singleton pregnancies being chromosomally normal, and most early losses stemming from random chromosomal abnormalities. With no identified underlying cause (e.g., structural uterine anomalies, coagulopathies, or endocrine disorders), the chance of a successful subsequent pregnancy remains high.

**Why Each Wrong Option is Incorrect**
**Option A:** *<5%* is incorrect. This underestimates the actual recurrence risk, which is higher than 5% due to factors like random aneuploidy in early gestation. **Option C:** *30%* is incorrect. This figure applies to patients with **two prior losses**, not one. **Option D:** *50%* is incorrect. Such a high risk is only seen in rare cases of RPL with multiple losses or severe maternal comorbidities. **Clinical Pearl / High-Yield Fact** A single first-trimester miscarriage does **not** indicate a high risk of recurrence. Reassure patients that 85–90% of subsequent pregnancies will proceed without complications. However, after **two or more** losses, further evaluation (e.g., karyotype, thyroid function, antiphospholipid antibodies) is warranted. **Correct Answer: B. 15–20%**

✓ Correct Answer: B. Is no different than it was prior to miscarriage