My husband has stopped initiating sex :-(

This is our first month TTC. Before now, hardly a night would go by without my husband hinting at sex. But now we're TTC, I'm the only one initiating... We've only been doing it every 3 or so days - which doesn't seem enough... And he's only come onto me once - after I told him I was a little frustrated that he didn't seem interested in sex any more but he supposedly wants a baby... "We need to do it to have a baby, you know..." 😞 I don't know what to do. Even this morning I jumped him & we got into it but he stopped saying we were late for work (which we were) & that we'd continue tonight. During the day I messaged him saying it was my fertile window & he seemed keen - but tonight, nothing! 😭