It's normal for a lot of windows. Just make sure the weepholes are clear or the water will run inward onto the sill.

Sometimes the holes are visible and sometimes they aren't. Usually, I just check the sills for water damage and if there's none you have to assume the holes are working. And also check them from the outside. As a side note on new construction I regularly scrape mortar/grout out of the holes that was slopped over when the stone siding was installed.