This function returns the number of orders, both open or pending, for the currency and the type specified.

getQtyOrders.mq4

// this function will return the quantity of orders (both open and pending)
// on the selected currency for the order type requested.
int getQtyOrders( int type, string sym ) {
    int result = 0;
	int tot = OrdersTotal();
	for ( int i = 0; i < tot; i++ ) {
		if ( OrderSelect( i, SELECT_BY_POS, MODE_TRADES ) ) {
			if ( OrderSymbol() == sym ) {
				if ( OrderType() == type ) {
					result += 1;
				}
			}
		}
	}
	return( result );
}