M.S.
You should have a return to normal fertility as soon as the IUD is removed. This means you can get pregnant as soon as you ovulate. In order to have good "dates" for the pregnancy (to know when you are due) it is a good idea to have a couple of cycles before you conceive, but that is the only reason. There are no increased risks with conceiving immediately after IUD removal. Also, just a reminder that it takes several months for most women to become pregnant once they start trying, so don't be worried if it doesn't happen immediately.
Good luck,
M.