I'm not talking about academic or scientific circles, but the first language a child is taught.
In the late Medieval period, no, it was by this point primarily used for either scholarly exchange or for liturgical purposes.
Latin as a first language disappears in the 8th and 9th centuries, when Romance languages began to evolve. So by the 11th and 12th centuries, it was only used as the scholarly language by the educated elite of Europe.