**Core Concept**
Methotrexate is a folate antagonist used in the treatment of various conditions, including rheumatoid arthritis and some cancers. Folate antagonists can cause fetal abnormalities if taken during pregnancy, particularly if used in combination with other teratogenic agents like oral contraceptive pills (OCPs).

**Why the Correct Answer is Right**
When a patient on methotrexate wants to conceive, it's crucial to adjust their medication regimen carefully. Methotrexate is a folate antagonist that can cause fetal abnormalities, especially when used in combination with OCPs, which are also known to have teratogenic effects. To minimize the risk of fetal abnormalities, the patient should discontinue methotrexate for at least 3 months before attempting conception. Additionally, the patient's wife should stop taking OCPs and allow her body to return to its natural cycle.

**Why Each Wrong Option is Incorrect**
**Option A:** Discontinuing methotrexate for only 1 month is insufficient, as the risk of fetal abnormalities persists for a longer duration.
**Option B:** Continuing methotrexate without adjusting the dosage is not advisable, as the risk of fetal abnormalities increases with the duration of methotrexate use.
**Option C:** Stopping OCPs is essential, but discontinuing methotrexate for only 2 weeks is not sufficient to minimize the risk of fetal abnormalities.

**Clinical Pearl / High-Yield Fact**
When counseling patients on methotrexate and OCPs, it's essential to emphasize the importance of discontinuing both medications at least 3 months before attempting conception to minimize the risk of fetal abnormalities.

**Correct Answer:** D. Discontinue methotrexate for at least 3 months and stop OCPs to minimize the risk of fetal abnormalities.