Infertility. Still not able to concieve.

Hi I am 31 years old female. I ttc from pars 3 years. In three years I concieved twice , first baby(in may 2016) was spontaneous abortion .that baby had chromosomal abnormility. Second pregnancy turned out ectopic ( in Jan 2017). It was aborted by methotrexate  injections no surgery was done. My husbands seman analysis is normal and I have been through so many tests like lh , fsh,prolactin , lipid profile, thyroid, amh, adenosine deaminase, lupus anticoagulant, ana , caediolipin igg, igm , vdlr , hiv, Hbsag, both partner karyotype and many other test. Everything is fine except my pp insulin 6  months ago was 130 for which I am taking metformin regularly. So many follicular study cycles also failed despite normal egg formation and rupture. I have cosulted so many doctors everybody says everything is fine just wait .Sometimes I think my tubes may be blocked but doctor says you have concieved twice and you dont have tb it means your tubes are fine but I am still not able to concieve.