Call the local bar association or ATLA for a lawyer that handles this kind of case in your area.
This information does not constitute am attorney / client relationship and is just a general answer to the question posed with the limited facts available. There is no substitute to a consultation with an attorney licensed in your State.
I am not licensed in your state and can provide you on,y general advice but it doesn't appear that anyone has given you any substantive advice. An ectopic pregnancy is a risk of an IUD. If you had signs or symptoms that were not diagnosed you may have a claim but otherwise it is unlikely that simply experiencing an ectopic is actionable.