I am trying to conceive. I was on letrozole from CD 3-7 and on CD 9 I had my first ultrasound and there was one follicle of 21 mm. The doc asked to use an hug trigger shot the same day. We had it at around 1.30 pm on Saturday. I had mild ovulation pain on Saturday but in today's ultrasound it shows as 24 mm. The radiologist says it's likely a cyst. But the doc says it will rupture. I am worried. Has the cycle gone for a toss. I usually ovulate by cd15. Pls help.