Man this weekend is going to suck. I go back to work on Monday after being off for eight weeks after baby #3 was born. I was home with #1 for six months before going back to work part-time, and I was able to take him with me. When #2 was born, I quit my job (couldn’t take two of them to the office and actually get anything done), stayed home, and went to school part time in the evenings for the next three years. They didn’t go to day care until two years ago, when I went back to work. I’ve been working for the past two years (gotta pay off those student loans!) and I knew it would be hard to go back to work after just two months, but I had no idea it would be THIS hard. I mean, I have three days left at home and all I want to do is sit and hold him and look at him and cuddle him and snuggle him. He is our last baby, and I just feel like I’m going to miss out on so much stuff that I was there for with the other two. I love our daycare provider and she is SO excited to finally have my baby in her care, but that doesn’t make it any easier. All I wanna do is hole up in bed with my baby and cry for the next three days. 
Oh Lord, I feel for you. I had six months with my first, twelve with my second. In neither case was it enough - and I think, tbh, it may always feel like never enough for some of us. You know from your own experience that you’ll get through this, that you’re not going to miss out on all you fear. If you’ve got good childcare, which it sounds like you have, your baby won’t suffer. A mum with greater financial stability and with something for herself outside of motherhood is a really good thing for your little man.
I know you know all this, and that none of it means a damn thing right now. Indulge yourself a bit at the moment - do the snuggling and the crying and the watching. Be as selfish with him as you like. It’s not fair, but it’s life, and it’ll be fine. Best of luck with your first week back - and if it helps, remind yourself you only ever have to do the first week this once!
I’m right there with you. I go back to work on September 3 and I’m already dreading it. I’m lucky in that I will have had almost 6 months with my baby but it still sucks. My MIL will be caring for her which is great on the one hand. On the other hand, it sucks that my MIL will get to spend more time with her than I do.
Good luck.
Thanks. The anticipation was much worse than reality. I cried a whole lot all weekend. But come Monday, everyone was fine.