No, these midweek fixtures are their own gameweek (GW15).
There won't be a double gameweek until later in the season when matches cancelled for latter round Cup fixtures are rescheduled. That's the time to use the chips!
Seem to hit a bit of a run in recent weeks. I'm out of the cup but picking up some decent points each week. Not that it is making any difference in any of the leagues I'm in!