My sister got pregnant on the iud, so its jus up to your body I guess!
Depends if it had hormones or not. My sister in law got pregnant her first cycle (with twins).
i had my first implant in after having my 1st child i had it in for 3 years and then the second put in, my son is now 5 so i had my implant in for 5 years more or less. me and the feller decided we wanted to have a baby and had the implant removed on the 28th feb 2012 and found out i was pregnant on the 6th oct 2012. so it only took roughly around 7/8 months. but everybody is diffrent jusy depends on how your body and diet is :)
Its different for everyone because I had the IUD for two years and it was taken out in mid December and I found out I was pregnant in January. But some women say it takes a while.