It is important to consult a doctor if you are experiencing diarrhea, especially after traveling to another country like Mexico. It could be a common condition known as traveler's diarrhea, which may require antibiotics prescribed by a doctor. If you are pregnant, it is especially important to seek medical advice to confirm the diagnosis and ensure the safety of your baby. In the meantime, make sure to stay hydrated by drinking a rehydration solution that can be found in pharmacies.