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

Hi. I'm 31 yrs old. I already have a kid 8 yrs old. It was a normal pregnancy and normal delivery. For my second pregnancy I'm trying for 5 months. Visited doctor two months back. On the 2nd day of periods they gave a tablet Letroz. On the 8th day my follicle size was 19mm. On 11th day they found two follicles in 22 and 23mm. Had ovulation injection On 11th day itself by evening 8 pm. They have asked me to be in relationship for one week. When will the egg be released. What is the apt time to be in relationship. How positive is my chances of pregnancy? Kindly help.