Number of Colors in Palette

I think that's fine. I personally prefer focusing on one or two colors which seems cleaner and more cohesive. Our colors were burgundy and gold with accents of plaid. My florist used that to create the floral arrangements, wreaths, garlands and bouquets. This is where any extra color came in, but it was a subtle touch. If you really wanted to add orange, you could have your florist incorporate it into the floral arrangements and use it to add a pop of color here and there.

Remember that by default most palettes include some green because of the greenery in the florals.

Totally agree with earias! You can add more colors if you want to, but there should really be 1-2 main colors with the rest of the color palette just accenting and supporting the main colors.

Here's some more wedding color inspiration if you need it

The Perfect Wedding Color Palette for Every Style

12 Ultra Violet Wedding Details for the Pantone-Obsessed

Ours is 3, red, tangerine, and silver\gray like you're describing. I think you're good with 2 colors, sometimes too many colors makes things look jumbled and thrown together IMO.

2 bright colors like royal purple and orange can look gaudy or more like a tailgate than a wedding if they overwhelm the space, but if you want the 3 you can pull it off, just be careful to balance them out throughout your ceremony and reception spaces.

I am doing main colors as Coral and Teal, but we have accented it with Silver.

I'm doing pink and silver as the main colors and white and green as the accent colors.

We're only doing two colors so I think you're just fine.