How do you keep the spark alive?

Kate
We've been trying for a year now with a MC in April. My husband is a cop and leaves for work at 4am, so we basically have a 2 hour timeframe between when he gets home and goes to bed. Sex has felt a lot like work lately, and he's starting to get a little frustrated and it's felt super forced. It's not my fault that I only have a few days that I'm fertile and that they don't coordinate with his work schedule! What do you ladies do to make your husband/SO feel like you actually like him and aren't just using him as a sperm donor (lol)?