Posted by Rowena on August 27, 2003 at 01:22:35:
In Reply to: Question posted by Rosie on August 25, 2003 at 12:05:46:
You are right a coil will stop the egg from becoming fertilized. A coil works as a contraception because it inhibits the fertilized ovum from attaching to the endometrium (lining of the uterus). The coil causes a slight inflammation to the lining of the uterus and this is why the fertilized ovum cannot attach. (Not an inflammation due to infection but because the coil is a foreign body.) It's about 98% effective in preventing a pregnancy. A coil should not effect the timing of your menstrual cycle. (That would be due to hormonal changes for some other reason.) A coil needs to be replaced after 3 years.