I have had IUI with and without clomid... in both situations we did hcg trigger shot.. I am almost 13wk pg now and that was without clomid... my RE also checked my follicle size and lining on cd12.. my lining was usually a little thin so he gave me a shot of estrogen to help thicken it up.. the one down side to that is there are some studies that suggest estrogen can increase your chance of ectopic.. It has gone both ways for me.. one time I had an ectopic and one time I got pg.. Another thing to remember with the lining is, it will continue to thicken until implantation which doesn't occur until 6 to 10 days after ovulation.. And sarge is correct.. the follicles will grow about 2 mm per day..
My response is kind of all over the place.. but in summary.. I think you are doing just great.. best of luck to you!! keep us posted please...
It all sounds good to me. Your follicles grow 2-3 mm per day, so you should be right on track. The Prometrium should help with the uterine lining, I believe. I'm not familiar with the baby aspirin, but I've heard others on this board use it so someone should be able to help with that . good luck