How to encourage husband to have more sex?

Julia
My husband works a lot, so we only have sex once a week on Saturday mornings. I'm not thrilled about it but I'll take what I can get. 
We are trying to have a baby and my fertile days fall during the week. How do I encourage my husband to have sex during the week without it feeling like a "chore"?! He's not really into lingerie ... The other day I wore an "outfit" and that was awkward - he def. felt uncomfortable. In addition it seems like he likes being the pursuer so me being aggressive and to initiate wouldn't turn him on either. Any advise would be greatly appreciated!