In this situation, are you warned that you are approaching a pedestrian crossing?

The sign visible on the right is A-17 'children', which warns of a place on the road particularly frequented by children or the proximity of a facility intended for them. It is not a sign warning of an approaching pedestrian crossing (that would be sign A-16). Consequently, the visible sign does not inform about approaching a crossing, which follows from § 8 of the Regulation on road signs and signals.