Python Battleships game random ship placement

I found a code academy lesson about battleship game and I'm trying to expand it a little. I added some code that allows to place multiple ships on the board but I've run into some issues when randomly placing ships namely, the ships sometimes overlaps.

As you see S should be of length 3. But B overlaps that. Below is the place_ship function. I would really appreciate some advice on what to fix.

def place_ship(board, ship_name):
    global ship_count, hiddenBoard
    ship = ""
    size = 0
    if ship_name == "Destroyer":
        ship, size = "D", 2
    elif ship_name == "Submarine":
        ship, size = "S", 3
    elif ship_name == "Battleship":
        ship, size = "B", 4
    ship_row, ship_col = random_row(board), random_col(board)
    orientation = bool(random.getrandbits(1))
    if orientation:
        while hiddenBoard[ship_row][ship_col] != "D" or "S" or "B":
            if ship_col + size not in range(10):
                ship_col -= size
            if ship_row + size not in range(10):
                ship_row -= size
            for x in range(0, size):
                hiddenBoard[ship_row][ship_col + x] = ship
                ship_count += 1
            break
    else:
        while hiddenBoard[ship_row][ship_col] != "D" or "S" or "B":
            if ship_row + size not in range(10):
                ship_row -= size
            if ship_col + size not in range(10):
                ship_col -= size
            for x in range(0, size):
                hiddenBoard[ship_row + x][ship_col] = ship
                ship_count += 1
            break