Dr Yeong Cheng Toh from Tow Yung clinic

Anyone been to Dr Yeong when TTC? Been going to him and during my last cycle he gave me Letrozole to eat for 5 days. I ovulated but no success. Thinking if i should go back to see him again. As i was advised to go back to him again if my period comes. But his fees arent cheap. Any success stories?