Q: My IUD was removed 3 months ago, when can we TTC?
A: The IUD acts locally on the uterus and the Fallopian tube preventing pregnancy. It does not have an effect on ovulation. After removal of the IUD you should be able to get pregnant similarly to before having had the IUD. However, in general there's only a 20-25% chance each month to get pregnant anyway, even if you do everything right. At your age, you should see your doctor if you haven't been able to get pregnant after 6 months.
However, if your cycle is irregular, you should discuss this with your doctor as soon as possible.