If I was in your situation and my startup closely aligned with pg's interests what I'd do is find a mutual contact who pg trusts and will give you a rave introduction.
For that matter the same applies to any other investor.
Honestly you are probably better off doing YC around when you'd do a Series A, or even slightly after, assuming all your investors would be ok with it (they should be), vs. really early.
For that matter the same applies to any other investor.