Hormone: There are different types of IUDs that contain a hormone similar to what is often found in birth control pills.
* وَيَعْتَقِدُ ٱلْبَعْضُ أَنَّ ٱللَّوْلَبَ ٱلنُّحَاسِيَّ يُغَيِّرُ سَمَاكَةَ بِطَانَةِ ٱلرَّحِمِ .‏