My husband is giving up on us having a baby’s

Ladies I need help my husband and I have been trying over a year to have a baby. He is to the point now to where he thinks it is him. He has a son and I have two children outside each other. I’m 27 and he is 24. I’m so lost cause I feel that it may be me. I don’t take opks we use to have sex every other day but he is really giving up and he doesn’t even want to keep trying. I need some help PLEASE..... I sit up at night and just cry because all he wants is to see a creation between the two of us. I need pointers please