Hi I'm 31 Yrs Old. I Already Have A Boy

Hi I'm 31 yrs old. I already have a boy kid. 8yrs old. It was a normal pregnancy and normal delivery. For the 2nd pregnancy. I tried for 5 months. It's was not positive. Hence visited doctor. They have Letroz on 2nd day of periods. On 8th day follicle size was 19mm. On 11th day two follicles were observed. One in 22mm and another in 23mm. Had Fertigin injection on 11th day night 8pm. Advised to be in relationship for one week. Had sex on the day I had injection. Have been given Tablet Evatone and Tablet Duphaston both twice daily from 15th day of cycle for 15 days. Wat is the time of possible ovulation. What is the chances of positive pregnancy this time? Thanks in advance.