Helo, My Wife Have Been Asked By Doctor To Take

helo, my wife have been asked by doctor to take primolut for 10 days, which she hasnt yet start to take.. since we are planning for a baby, and that my wife is on her fertile days and will ovulate in 2 days, is it safe to take primolut or not? confused whether to take it or not.. as i heard that taking primolut will cause bleeding, thus even if got intercouse on her fetile days, she waont get pregnant?Thanks