IUD itself does not cause infertility usually; unless associated with the infection. IUD is not advised to be kept for more than its duration, as it can cause infection and can be ineffective as contraceptive. But if there was no infection or any other complication, infertility is not very common.
Please feel free for your follow up questions.
How do i know if i have an ifection if i dont feel anything
An infection will have symptoms like foul smelling discharge and cramps.
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During the periods, slight smell or cramps are not abnormal. If you have been trying for the pregnancy for more than a year, it would be prudent to get blood work for the hormone estimation by your PCP or gynecologist.
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