A trained doctor or a nurse can take IUCD out at any time by pulling gently on the threads. Sperms can live for upto seven days inside your body and could cause a pregnancy once the IUCD is removed.
If you are not going to have another IUCD inserted, and you do not want to became pregnant, use additional contraception, such as condoms, for seven days before the IUCD is taken out. This is to stop sperms getting into your uterus.
Your fertility returns to normal as soon as the IUCD is taken out.