MEN (and women!); my husband has a low sex drive and I need help!

Guys, please give me your advice. Me and my husband are TTC. He works a lot, much more than full time. He’s understandably tired. I have a very high sex drive on top of TTCing...I am in good shape and try to keep it sexy for my husband and am still getting turned down...I sent him a pic of my in lingerie and he literally never responded to me...what gives? I’ve addressed the issue and he says:

-I’m not trying to make a weekly quota with sex, it happens when it happens

-I’m working so much and I’m just exhausted

-a baby will happen when it’s meant to happen

-I don’t appreciate being bothered about it when you know I’m constantly working.

We have sex 3-4 times a month MAYBE. Probably 1-2 in my fertile week, if I’m lucky. Can I have a mans perspective please? Or someone experienced with this?

I do try my best to respect his feelings and I don’t bother him about it. I’m very sexually attracted to him and it’s starting to feel like he isn’t to me, even though I know I’m in shape and there’s no reason for him not to be....and no he’s not cheating. I’m positive of this. He doesn’t hide anything and not acting sketchy. Just literally too tired and no drive.

This is the picture I sent him and got no response...(just for reference)

I should also add that we have a 2.5 year old son already, and we’ve been having this issue about a year before TTC #2....