It is possible to conceive naturally even with endometriosis
under control. IUI in the next cycle is based on predicting the ovulation through follicular monitoring. There is nothing else that can make you conceive naturally faster than this. If you insist on a quicker mode of conception, you should ask your consultant on the use of ART procedures in your case. You should be ovulating naturally or you can also be put on induction for ART purposes. Hope you find this information useful. Wish you good health.