Hi, thank you for query madam, The follicle needs to reach a size of 18-24mms in order for ovulation to occur. Anything less than that will not lead to ovulation. Without ovulation, pregnancy cannot occur. So, based on the CD#11 ultrasound, your right follicle has not reached an appropriate size and may indicate that it is not growing, which in turn, indicates that the medication you used is not working. My recommendation would be to repeat the ultrasound at CD#14 and CD#16. If there is not ovulatory sized follicle at those points, then the cycle should be cancelled due to lack of response, you should be given provera for 10 days to induce a period, then start a new cycle using Clomid at 150 mg per day.