Did we say I love you too soon?

I've been dating my boyfriend for 6 months but we've been best friends for 4 years and are both 15. Yesterday we had our banquet for our marching band and following it was a dance. We danced for nearly 2 hours. Us being 15, his mom drove us home and he walked me to my door. We hugged (haven't kiss but we both come from pretty conservative Christian families and both are saving ourselves for marriage so we're taking it fairly slow) and as we pulled apart we said I love you. We've discussed saying I love you actually and we both feel that we do love eah other but being so young we can't say we're "in love". What do you all think? Was it too soon in the relationship?