<s>[INST] hidoctori am suffering from hypothyrodism and PCOS and trying to get pregnant . i am taking metformin 500mg and siphene -100 from 3rd day of the cycle . and my doc has asked me to take an hcg injection on the 9th and 11th day  and get a TVS done on the 12th day i want to know when should we have intercource [/INST] Hello,In case of 28-30 days regular cycle, you need to do unprotected sex from 11th to 19th day of each cycle. These are the most fertile days of your cycle.You can use ovulation prediction kit to track down ovulation time and it helps to maximize chance of pregnancy.Take Folic acid and vitamin supplements for at least 3 months. Good luck. </s>