For a peace of mind I checked your pamphlet online and you do not need a backup method. You remain protected if you miss a singular active pill.
I’m not sure if you can see images but your pamphlet states the following:
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WHAT TO DO IF YOU MISS PILLS
If you MISS 1 gray, light blue, or blue “active” pill:
1. Take it as soon as you remember. Take your next pill at your regular time. This means you may take 2 pills in 1 day.
2. You do not need to use a back-up birth control method if you have sex.
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And then it goes on what to do when you miss 2 or more, but that’s not your case.