Hi dear, to conceive naturally, it depends on many factors. If ur one tube is already removed then ur right tube must be patent for conception and also If u had 2 miscarriages it doesn't mean they were due to IUI. Vitamins and natural products can definitely help but untill unless both of partners have undergone all tests and they are normal.
Next Steps
plz check why u had IUI at first place.
If all ur tests are normal, u can definitely go for natural ways.