How to avoid getting pregnant after mercury exposure

Now Playing: New guidelines for flu vaccinations Now Playing:’I know what you’re thinking’: Watch The Good Wife star and actor talk about Trump’s presidency Now Playing’: ‘The Night Of’ star returns to Netflix for its ninth season Now Playing’You may not have the answer’: Trump defends his immigration ban Now Playing Trump signs executive order restricting travel to the U.S. from six Muslim-majority countries Now Playing President Donald Trump signs an executive order temporarily banning citizens of Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen from entering the U…