Back to work

Today is my last day home with my LO. Luckily I was able to stay home 16 weeks with him, but it still doesn't feel like enough time. I feel like I'm going to miss out on so much during the week. I know he'll be in good hands with my parents during the work week but it's still hard knowing I won't be with him all day everyday. I'm hoping I'll be busy at work so I won't have much time to be sad. How did you other mommies cope with going back to work?