I'll respond as my 2 month old sits on my lap!
Here's what I do, but keep in mind I have 2 older children that also need my attention! I really keep the activity low key esp. if Caeden hasn't gotten a good nap the cycle before (occasionally he does spurts of 45 min naps). But if he's gotten good rest, he plays under the toy bar and for about 75% of that time he usually has a big brother under there with him
or doting over him right in his face (we're working on that...). We often talk to him, his brothers are always trying to get him to smile at them or coo. We often have music playing (big brothers are into the beach boys lately) but if they don't have something on, I'll put some Mozart or something. Sometimes I'm carrying him from room to room as I clean, or he's laying on somebody's bed while we're cleaning bedrooms.
I just try to keep in mind what type of activity he had when doing wind down. So if it wasn't so low-key, I make sure to build in some extra wind down time if the older 2 permit.
I think you just have to get to know your child and figure out what she likes. I think for the most part she'll let you know if her A time was too stimulating, by having a hard time settling. I don't think talking to her is too stimulating and it certainly helps you all to bond.
I'm sure you and DP are doing great, just relax and enjoy these early months getting to know each other!