The short answer is not always. I have been tracking and trading Unusual Options Activity for many years and I have seen both Bullish & Bearish sweeps on the Call side. What this means is that you can have a sweep order to sell Calls which is essentially taking a bearish position.
Normally a bearish Call sweep will see the order coming through on the “Bid side” .
This is what a bearish call sweep looks like. Notice the Calls were swept on the "Bidside"