Yep. We did two IUI’s both failed. Got pregnant naturally 2 months later

It took 4 times of IUI to conceive our first and then the second (which ended in miscarriage) and third pregnancy took the first time.

Yes, very common. IUI doesn’t raise your chances of pregnancy much more than those of naturally conceiving. And they say that if it doesn’t work after 3 or 4 tries, it likely won’t work for you. Good luck to you! Don’t be discouraged! Keep trying!