<s>[INST] Hello, We are ttc. On day 15 of my follicle monitoring, the dominant follicle size was 11 *11. An ultrasound on day 17 showed rupture of this follicle with mild free fluid. Does this indicate ovulation? If yes, then would have the ovulation occurred? Is ovulation possible with 11 mm dimension? My cycles are regular and are of 26-27 days. With this cycle length, is ovulation on 17 day healthy? Regards, Rekha [/INST] Hi thanks for writing to Chat Doctor. I have gone through your question. Follicles usually rupture after getting at least 16/17 mm. But free fluid usually appears after ovulation. Free fluid suggest ovulation has taken place. Follicle size varies when ultrasound done by trans vaginal or trans abdominal route. Ovulation can occur on 17th day. For ovulation u can do urine LH kit test. Consult gynecologist for further advise. Have a healthy life. </s>