I've seen it happen. It all depends on your relievers and what settings you've chosen for their Inning Availability. If it's "any" (which looks like the case here), it means they can come in as early as the 1st if the starter is in trouble. And yeah, depending on your Call Bullpen setting (if it's say 3 or more), a few hits/few runs in one inning is considered "in trouble" by Sparky.