HI, I understand your concern. For planning pregnancy, you should get basic tests like ovulation study & semen analysis. with general investigations like hormonal assay ( Thyroid/ diabetic profile, hb % )except the ones you have already checked. Thyroid hormone normality is important for conception. Taking Folic acid, B12 & omega three fatty acid supplements 3 months before conception helps. ovulation day can be found by LH surge test. Once you locate it, have unprotected sex a couple of days before & after probable ovulation. Pregnancy confirmed after 8 days delay in period.. followed by consultation of gynecologist for necessary treatment ( specially hormone Progesterone supplement ,considering history of previous abortion ) If there is delay in conception IUI can be tried foe good results. Thanks.