I need opinions, I'm going a bit crazy!

I work from home full time.. I have a 4 year old who will be in pre-k come August 3 full days a week and my son was born on May 19th. I found a nanny who can watch my son at her house (she only watches at her house due to her asthma) for 3-4 days a week.  I am second guessing this being my son will be 2 or 3 months old only depending when I go back to work. I originally didn't want someone in my house while I am home working but the thought of my son being away from me and the house at such a young age is making me re-think things. Also if I had someone at my house they could also look after my 4 year old if or when needed. What are your thoughts? I'm literally racking my brain about this. Ugh 😂