###Human: Will Trust pills work as emergency contraceptive pills after unprotected sex? ###Assistant: Hi. The Levonorgestrel content from trust pills is too low. You will need five pills taken at the same time, then another five pills after 12 hours. However, your partner may feel nauseous and uneasy because this pill also contains Estrogen and a high dose of it also have side effects of nausea and vomiting. But yes, theoretically you can substitute it but be ready for the estrogen effects.