Husband on clomid 25mg to boost sperm count

Justfaith • 31 y/o Mommy of 1 little boy!! Hubby and I are trying to conceive our first baby together!!
We been trying for 12 mnths and nothing. Recently found out he has a low count of 3 million. I was tested Nd I am fine a regulate as well as I have enough eggs. Don't get why his count is low and he has 3 kids from another marriage. I have one from a previous relationship.