Please help. Unexplained infertility

Hello all lovelies

My Husband and I have been ttc for about 2 years and only for pregnant ONCE with IVF but lost bubs at 4 weeks.

Hubby wants to do more tests before a second try of IVF.

We have done sperm check, tubes checked, AHM checked etc.

Is there anything else out there? We want to know why!?!?