Feeling lost

Hubby and I have been ttc for a year since our mc Feb 2018...

Progesterone and prolactin are normal, anatomy is normal, follicle count looks good. Since we had a pregnancy they aren’t worried about husbands sperm.

Was told to try this cycle naturally with +opk and options moving forward are medicated IUI with letrozole or surgery to look for endometriosis. I don’t have painful periods but my cervix was pushed slightly to the left and I have some mild mid cycle pain(which I thought was just ovulation) so could have mild endo.

I’m torn on what to do... it seems like IUI has terribly low success rates and not sure if it’s worth trying before having surgery. Feeling defeated. Anyone have any similar experiences?