Any other mama's felt this way too?

So we enrolled my 3yr son for preschool two days a week again this upcoming fall. My head liked the idea of three days, but my heart felt hesitant to let him go too soon. I love having him home with me, but he's so eager for learning. He can do all the learning through life, but can't replace those times that could be missed out when his 2nd baby sister arrives! Also, it won't be too long before he's in full time, so I want to soak up whatever time I do have left with him now before he's 4 next year and will go 3 days instead.

Do any other mamas out there feel like this with their LO?