Ob-Gyn questions? Ask a gynecologist online.
Hi and welcome.
Plan B is safe in a way that it delays ovulation or prevent fertilization by altering tubal transport of the sperm and the third mechanism may be prevention of implantation. However it does not cause birth defects if pregnancy occurs. So the choice is yours as it prevents fertilization on the first hand.
Let me know if you have further questions.
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Wish you good health.