Marinewifetobe,
Relax, take a deep breath. The rainy season is a figurative term. Aruba is an island at the southern edge of the Caribbean. It can rain anytime for a few minutes, an hour, or not for weeks.
Your special day will be fine regardless of the weather, because you guys love each other and the weather won't change that. Sure, you're making all kinds of preparations and want that perfect day and that's important. But don't lose sight of what's really important which is the meaning of this day.
Back to the weather, Aruba is subject to showers but it really doesn't often rain all day the way it does on more tropical islands or locales. And I've never seen it rain several days in row (this over more than 14 years, including many stays that last in excess of 2-3 months).
You have a good plan to come to Aruba, stick to it and enjoy.