Clomid 50 mg to 100mg

Hi ladies! I took 5 days of 50mg clomid cycle days 3-7. My first ultra sound Monday showed one follicle at 14mm. My RE wanted to do a recheck today hoping it would grow to 18mm so he could administer HCG shot. Unfortunately it only grew to 14.6mm. They did blood work and said if my estrogen levels were high they would recheck in two days. If my estrogen was baseline then they would put me on 100mg of clomid starting to tomorrow. Does anyone have success stories of folicle growth by starting a higher dose of clomid mid-cycle? Any insight would be helpful!!