Husband advice

Me and my husband are trying for our first baby for 4 months now. I normally put on a sexy little outfit for him when I'm fertle an we have sex. The past 2 times he couldn't cum when we tried to have sex after I wore a cute outfit, one time last month and it just happened again this morning. He's also never in the mood he could go months without sex and be perfectly fine, me however I need it like once a week. Maybe his tostesterone is low or maybe he doesn't find me attractive is what's going on we can't babymake like this. He was like "I'm Def not gonna finish today" so I gave him a long blow job. And he said hard but couldn't finish I don't get it. Any advice?