Are you talking about the mirena iud?? It prevents sperm from fertilizing an egg. In rare cases and egg could get fertilized, but the iud would prevent it from attaching to the uterine wall to grow - it would just be flushed out of your system.

I had the mirena for almost two yrs and just had it removed last week because i found out that it was. yes it does prevent the egg and sperm from meeting acting as a spermicidal. But there are cases where the egg and sperm meet. Therefore sperm fertilizes the egg. (the begining of conception.) The iud makes your uterine wall thins so the egg does not attach. If you are pro-life i would not recommend you getting this....do natural family planning.

options to try: cycle beads.....can be bought online for less that $20.

go to www.fertilityfriend.com (great website)