What Is The Success Rate Of Using Letsi 2.5mg While Having PCO?

Hi Doctor, I am 29 years, having PCO problem. I generally have a 40-42 day cycle. My doc prescribed letsi 2.5 mg this cycle for ovolution. On CD 23 I had a mature follicle of 1.4*1.4cm and ruptured as well. Also did a HSG scan and found to be normal. Today I am on CD 40 with no signs of my periods. Pls advise what is the success rate. I have not been having any PG symptoms as well (including mplantation bleeding). How long do i need to wait to test.