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I would like to know your endometrial thickness on the day of ovulation. For successful pregnancy it should be atleast 7 mm. If endo thickness is persistently less during IUI cycles then you should undergo diagnostic hysteroscopy
( where uterine cavity
is directly visualized using a camera ) and also endometrial biopsy
need to be taken to rule out tuberculosis
. If everything comes out to be normal then there are certain medicines which can be used to improve endo thickness with mixed success like estradiol valerate
, arginine, vit E , pentoxyphylline , sildenafil. You can discuss options with your treating doctor. You can proceed for one or two more cycle of IUI with stimulation by gonadotropin injections instead of clomiphene . If these treatment also fail then IVF and surrogacy are last options. For husband's problem IUI with donor sperms can be done. All the best .