early in the morning before you headed to your office:
"Good morning, I just wanted to let you know I'm not going to make it in today; I was sick last night and as it turns out my husband needs my car anyway, his is broken down and he didn't have another way to work."
"Good morning, I just wanted to let you know I'm not going to make it in today; I was sick last night and as it turns out my husband needs my car anyway, his is broken down and he didn't have another way to work."