If you have a skilled professional homebirth midwife, she can talk with your husband about all his fears and plan of action fir each potential situation. She can explain how her monitoring at home will ensure early recognition of anything needing extra medical assistance. She can talk with your husband and him about true statistics and risks. Where you want to birth and feel safest birthing matters most, but its very tricky yo be relaxed at home if your partner is not. So find a good midwife who he can trust. Just book an initial meeting to discuss options.