everything came back positive

Been trying for 3.5 years and has all the test possible for me and everything came back with good news i can have children but it's not happening, my husband has been tested and it came back postive too.
thinking this was my month my period came 4 days early it's not heavy at all but it's there ...I don't know what to do I feel so empty I feel like we're having sex wrong, has anyone gone through what I'm going through or advice about conceiving