Lets say one or more of
1) The Germans prioritize these earlier.
2) The Peenumunde bombing raid doesn't happen or happens later (I believe the British pieced some intel from a POW captured in Tunisia, maybe he dies inbattle instead).
3) Some bad breaks in the R/D go luckier for the Germans.
So lets say:
a) V1s start hitting London in March.
b) V2s start hitting London in June.
c) Since Hitler will have his retaliation weapon soon, he cancels the Baby Blitz, preserving bomber strength for D-Day or just shuts down heavy bomber production earlier if people are wondering where the resources to make these earlier are coming from.
What happens????
a) Could this divert Allied Bombers from the strategic oil offensive to deal with the V1/V2 threat.
b) Affect D-Day plans and the follow up (a landing in the Pas De Calais instead)
c) With a bigger headliner role for the rockets in the war, would this affect post war rocket development.