help to decide 7 or 14 days pass

Not sure if would save me money or not by going with the 14 day JR Pass.

Should I get only the 7 days JRPass and activate it on day 10?

My itinerary is:

Day 1: Arrival at Haneda
Day 2: Tokyo
Day 3: Tokyo
Day4: Tokyo - Disney
Day 5: Tokyo Disney Sea
Day 6: Go to Fujikawaguchiko and sleep there
Day 7: Go to Kyoto
Day 8: Kyoto
Day 9: Kyoto
Day 10: Go to Osaka
Day 11: Osaka
Day 12: Osaka - Universal Studios
Day 13: Osaka - Round trip to Nara
Day 14: Osaka - Round trip to Kobe
Day 15: Osaka - Round trip to Hiroshima+Miyajima
Day 16: Go back to Tokyo
Day 17: Tokyo
Day 18: Tokyo - go to Haneda Airport

Appreciate any thoughts and inputs.

Thank you!