It definitely looks like a sativa, the shape of the leaves is super skinny and leanghty and that are the characteristics look of a sativa plant.
Sativa usually have a lemon / citrus smell so do finger rub test to smell it.
But just because it looks like a sativa does not mean it will have a sativa affect, almost all plants now a days are hybrids so you are just going to have to wait and fell the effect.
Sativa have a long flowering time compared to indicas so that might be a tell sign.