Since endometrium is showing no progress, the chances of conceiving are less. More over the endometrium should have triple line pattern on transvaginal sonography
Usually good endometrium should be between 8 to 12 mms. in thickness with triple line.
With the size of follicle you have mentioned it is not likely to result in conception, but if it has increased to 18 mms. or more in subsequent studies, there is hope, provided endometrium also improves.