I'm getting married in May and I chose burgundy dresses with pink flowers. Is this okay for spring?

Actually, any color that blooms in spring is totally appropriate, i.e. lilacs bloom in spring in a full range of purples, burgundies, lilacs, pinks, and white. It's your wedding, and the most important people there will be you, the bride, and your soon to be husband. Pick the colors you like, get stoked about it, and everyone will enjoy it because you do. Best wishes!