They will not recalculate anything because this is a life event. You can add while in processing or Post PPR.
I am in this boat. I got married after getting AOR. Even though I can add her now, But I will add my spouse after I get my PPR.
I am doing this upon my friend's suggestion. Even he did the same thing.
He got married after applying PR. In the PPR email IRCC will ask to report if there are any changes in your marital status, address, child birth's or death of any person included in the application. At that time you can inform them IRCC that you got married after applying PR.
So my friend added his spouse after getting PPR. They simply reopened his application and processed his spouse as well and again sent a new PPR requesting both of their passports. IRCC took another 45 days I guess to add spouse and send another PPR.
Advantages of this process:-
1. Firstly your processing will not get disturbed. Try to complete your process smooth and get PPR.
2. The only documents you need to submit is legal marriage certificate, some wedding photos, medicals of your spouse and PCC of all countries she lived for more than 6 months. My friend submitted only these docs it seems. No need to submit her ECA's, work experience letters, IELTS etc...
3. Your CRS score will not get impacted.
Bottom line - This is a life event which happend like that after applying to PR.
But end of the day it's your decision to add spouse while your PR is in processing or post PPR. You can do it either way.
I thought of getting my PPR first and then add my spouse. So I am doing in this way.
FYI... sample PPR email looks like this.
https://www.canadavisa.com/canada-immigration-discussion-board/threads/ppr-mail.551449/